20670651520 has 32 divisors (see below), whose sum is σ = 49415777820. Its totient is φ = 8268260352.

The previous prime is 20670651493. The next prime is 20670651569. The reversal of 20670651520 is 2515607602.

It can be written as a sum of positive squares in 2 ways, for example, as 18843601984 + 1827049536 = 137272^2 + 42744^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×20670651520² (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, 16148307 + ... + 16149586.

Almost surely, 2^20670651520 is an apocalyptic number.

20670651520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20670651520 is an abundant number, since it is smaller than the sum of its proper divisors (28745126300).

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

20670651520 is an equidigital number, since it uses as much as digits as its factorization.

20670651520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32297912 (or 32297900 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 20670651520 in words is "twenty billion, six hundred seventy million, six hundred fifty-one thousand, five hundred twenty".