Search a number
-
+
20985477 = 310169259
BaseRepresentation
bin101000000001…
…1011010000101
31110111011122220
41100003122011
520333013402
62025442553
7343242102
oct120033205
943434586
1020985477
1110933777
127040459
134469b56
142b03aa9
151c97dbc
hex1403685

20985477 has 8 divisors (see below), whose sum is σ = 28258080. Its totient is φ = 13851600.

The previous prime is 20985467. The next prime is 20985479. The reversal of 20985477 is 77458902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20985477 - 26 = 20985413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34327 + ... + 34932.

It is an arithmetic number, because the mean of its divisors is an integer number (3532260).

Almost surely, 220985477 is an apocalyptic number.

It is an amenable number.

20985477 is a deficient number, since it is larger than the sum of its proper divisors (7272603).

20985477 is a wasteful number, since it uses less digits than its factorization.

20985477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69363.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20985477 is about 4580.9908316870. The cubic root of 20985477 is about 275.8288032001.

The spelling of 20985477 in words is "twenty million, nine hundred eighty-five thousand, four hundred seventy-seven".

Divisors: 1 3 101 303 69259 207777 6995159 20985477