20651632500 has 60 divisors (see below), whose sum is σ = 60214675136. Its totient is φ = 5507100000.

The previous prime is 20651632481. The next prime is 20651632523. The reversal of 20651632500 is 523615602.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1369276 + ... + 1384275.

Almost surely, 2^20651632500 is an apocalyptic number.

20651632500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20651632500 is an abundant number, since it is smaller than the sum of its proper divisors (39563042636).

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

20651632500 is a wasteful number, since it uses less digits than its factorization.

20651632500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753578 (or 2753561 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 20651632500 in words is "twenty billion, six hundred fifty-one million, six hundred thirty-two thousand, five hundred".