20512470156 has 12 divisors (see below), whose sum is σ = 47862430392. Its totient is φ = 6837490048.

The previous prime is 20512470137. The next prime is 20512470161. The reversal of 20512470156 is 65107421502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20512470156² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854686245 + ... + 854686268.

It is an arithmetic number, because the mean of its divisors is an integer number (3988535866).

Almost surely, 2^20512470156 is an apocalyptic number.

It is an amenable number.

20512470156 is an abundant number, since it is smaller than the sum of its proper divisors (27349960236).

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

20512470156 is a wasteful number, since it uses less digits than its factorization.

20512470156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709372520 (or 1709372518 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

Adding to 20512470156 its reverse (65107421502), we get a palindrome (85619891658).

The spelling of 20512470156 in words is "twenty billion, five hundred twelve million, four hundred seventy thousand, one hundred fifty-six".