20645251500480 has 56 divisors (see below), whose sum is σ = 65548673517072. Its totient is φ = 5505400399872.

The previous prime is 20645251500479. The next prime is 20645251500529. The reversal of 20645251500480 is 8400515254602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10752734197 + ... + 10752736116.

Almost surely, 2^{20645251500480} is an apocalyptic number.

20645251500480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20645251500480 is an abundant number, since it is smaller than the sum of its proper divisors (44903422016592).

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

20645251500480 is a wasteful number, since it uses less digits than its factorization.

20645251500480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21505470333 (or 21505470323 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 42.

The spelling of 20645251500480 in words is "twenty trillion, six hundred forty-five billion, two hundred fifty-one million, five hundred thousand, four hundred eighty".