20305615264 has 24 divisors (see below), whose sum is σ = 43610924448. Its totient is φ = 9229824960.

The previous prime is 20305615247. The next prime is 20305615277. The reversal of 20305615264 is 46251650302.

It is a super-2 number, since 2×20305615264² (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, 28842852 + ... + 28843555.

It is an arithmetic number, because the mean of its divisors is an integer number (1817121852).

Almost surely, 2^20305615264 is an apocalyptic number.

It is an amenable number.

20305615264 is an abundant number, since it is smaller than the sum of its proper divisors (23305309184).

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

20305615264 is a wasteful number, since it uses less digits than its factorization.

20305615264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57686428 (or 57686420 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 20305615264 in words is "twenty billion, three hundred five million, six hundred fifteen thousand, two hundred sixty-four".