20507891304 has 64 divisors (see below), whose sum is σ = 53523699840. Its totient is φ = 6535710720.

The previous prime is 20507891267. The next prime is 20507891317. The reversal of 20507891304 is 40319870502.

It is a super-3 number, since 3×20507891304³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1384224 + ... + 1398960.

It is an arithmetic number, because the mean of its divisors is an integer number (836307810).

Almost surely, 2^20507891304 is an apocalyptic number.

20507891304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20507891304 is an abundant number, since it is smaller than the sum of its proper divisors (33015808536).

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

20507891304 is a wasteful number, since it uses less digits than its factorization.

20507891304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17290 (or 17286 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 20507891304 in words is "twenty billion, five hundred seven million, eight hundred ninety-one thousand, three hundred four".