20021607500 has 30 divisors (see below), whose sum is σ = 43783256748. Its totient is φ = 8008642000.

The previous prime is 20021607493. The next prime is 20021607553. The reversal of 20021607500 is 570612002.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4001822 + ... + 4006821.

Almost surely, 2^20021607500 is an apocalyptic number.

20021607500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021607500 is an abundant number, since it is smaller than the sum of its proper divisors (23761649248).

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

20021607500 is an equidigital number, since it uses as much as digits as its factorization.

20021607500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008667 (or 8008650 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The spelling of 20021607500 in words is "twenty billion, twenty-one million, six hundred seven thousand, five hundred".