20764735155 has 96 divisors (see below), whose sum is σ = 38421190080. Its totient is φ = 10752030720.

The previous prime is 20764735151. The next prime is 20764735157. The reversal of 20764735155 is 55153746702.

It is a happy number.

20764735155 is a `hidden beast` number, since 2 + 0 + 7 + 64 + 73 + 515 + 5 = 666.

It is not a de Polignac number, because 20764735155 - 2² = 20764735151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20764735155.

It is not an unprimeable number, because it can be changed into a prime (20764735151) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11606001 + ... + 11607789.

It is an arithmetic number, because the mean of its divisors is an integer number (400220730).

Almost surely, 2^20764735155 is an apocalyptic number.

20764735155 is a deficient number, since it is larger than the sum of its proper divisors (17656454925).

20764735155 is a wasteful number, since it uses less digits than its factorization.

20764735155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083 (or 2071 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 20764735155 in words is "twenty billion, seven hundred sixty-four million, seven hundred thirty-five thousand, one hundred fifty-five".