Search a number
-
+
20431894780 = 22511312995879
BaseRepresentation
bin10011000001110101…
…011111100011111100
31221201221012210111201
4103001311133203330
5313321031113110
613215234225244
71322215145233
oct230165374374
957657183451
1020431894780
1187352a9a60
123b62725224
131c0800578b
14dbb7cdb1a
157e8b2eb3a
hex4c1d5f8fc

20431894780 has 48 divisors (see below), whose sum is σ = 48317552640. Its totient is φ = 7190107200.

The previous prime is 20431894753. The next prime is 20431894799. The reversal of 20431894780 is 8749813402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431894780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1491120 + ... + 1504759.

It is an arithmetic number, because the mean of its divisors is an integer number (1006615680).

Almost surely, 220431894780 is an apocalyptic number.

20431894780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431894780 is an abundant number, since it is smaller than the sum of its proper divisors (27885657860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431894780 is a wasteful number, since it uses less digits than its factorization.

20431894780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995930 (or 2995928 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 20431894780 in words is "twenty billion, four hundred thirty-one million, eight hundred ninety-four thousand, seven hundred eighty".

Divisors: 1 2 4 5 10 11 20 22 31 44 55 62 110 124 155 220 310 341 620 682 1364 1705 3410 6820 2995879 5991758 11983516 14979395 29958790 32954669 59917580 65909338 92872249 131818676 164773345 185744498 329546690 371488996 464361245 659093380 928722490 1021594739 1857444980 2043189478 4086378956 5107973695 10215947390 20431894780