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20347669940 = 2251378260269
BaseRepresentation
bin10010111100110100…
…001100110110110100
31221112001201201202012
4102330310030312310
5313133000414230
613203025103352
71320143224613
oct227464146664
957461651665
1020347669940
1186a1802654
123b3a487b58
131bc37263b0
14db054787a
157e1544395
hex4bcd0cdb4

20347669940 has 24 divisors (see below), whose sum is σ = 46017038760. Its totient is φ = 7512985728.

The previous prime is 20347669933. The next prime is 20347669957. The reversal of 20347669940 is 4996674302.

It can be written as a sum of positive squares in 4 ways, for example, as 4691154064 + 15656515876 = 68492^2 + 125126^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39129875 + ... + 39130394.

It is an arithmetic number, because the mean of its divisors is an integer number (1917376615).

Almost surely, 220347669940 is an apocalyptic number.

20347669940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20347669940 is an abundant number, since it is smaller than the sum of its proper divisors (25669368820).

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

20347669940 is a wasteful number, since it uses less digits than its factorization.

20347669940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78260291 (or 78260289 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 20347669940 in words is "twenty billion, three hundred forty-seven million, six hundred sixty-nine thousand, nine hundred forty".

Divisors: 1 2 4 5 10 13 20 26 52 65 130 260 78260269 156520538 313041076 391301345 782602690 1017383497 1565205380 2034766994 4069533988 5086917485 10173834970 20347669940