20521010764 has 24 divisors (see below), whose sum is σ = 36292231808. Its totient is φ = 10151861760.

The previous prime is 20521010689. The next prime is 20521010767. The reversal of 20521010764 is 46701012502.

It is a super-2 number, since 2×20521010764² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521010767) 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, 2242342 + ... + 2251474.

Almost surely, 2^20521010764 is an apocalyptic number.

It is an amenable number.

20521010764 is a deficient number, since it is larger than the sum of its proper divisors (15771221044).

20521010764 is a wasteful number, since it uses less digits than its factorization.

20521010764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15025 (or 15023 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 20521010764 in words is "twenty billion, five hundred twenty-one million, ten thousand, seven hundred sixty-four".