20556107061 has 24 divisors (see below), whose sum is σ = 31891948704. Its totient is φ = 11743028640.

The previous prime is 20556107023. The next prime is 20556107069. The reversal of 20556107061 is 16070165502.

It is not a de Polignac number, because 20556107061 - 2⁶ = 20556106997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556107069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560071 + ... + 595643.

It is an arithmetic number, because the mean of its divisors is an integer number (1328831196).

Almost surely, 2^20556107061 is an apocalyptic number.

20556107061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20556107061 is a deficient number, since it is larger than the sum of its proper divisors (11335841643).

20556107061 is a wasteful number, since it uses less digits than its factorization.

20556107061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39521 (or 39514 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 20556107061 in words is "twenty billion, five hundred fifty-six million, one hundred seven thousand, sixty-one".