20556153729 has 8 divisors (see below), whose sum is σ = 30453561120. Its totient is φ = 13704102468.

The previous prime is 20556153727. The next prime is 20556153763. The reversal of 20556153729 is 92735165502.

20556153729 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 615 + 3 + 7 + 29 = 666.

It is not a de Polignac number, because 20556153729 - 2¹ = 20556153727 is a prime.

It is a super-2 number, since 2×20556153729² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20556153727) 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, 380669487 + ... + 380669540.

It is an arithmetic number, because the mean of its divisors is an integer number (3806695140).

Almost surely, 2^20556153729 is an apocalyptic number.

It is an amenable number.

20556153729 is a deficient number, since it is larger than the sum of its proper divisors (9897407391).

20556153729 is an equidigital number, since it uses as much as digits as its factorization.

20556153729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761339036 (or 761339030 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 20556153729 in words is "twenty billion, five hundred fifty-six million, one hundred fifty-three thousand, seven hundred twenty-nine".