20212637520 has 80 divisors (see below), whose sum is σ = 62694058752. Its totient is φ = 5387036160.

The previous prime is 20212637483. The next prime is 20212637527. The reversal of 20212637520 is 2573621202.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212637527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426534 + ... + 471546.

Almost surely, 2^20212637520 is an apocalyptic number.

20212637520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212637520 is an abundant number, since it is smaller than the sum of its proper divisors (42481421232).

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

20212637520 is a wasteful number, since it uses less digits than its factorization.

20212637520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46900 (or 46894 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The spelling of 20212637520 in words is "twenty billion, two hundred twelve million, six hundred thirty-seven thousand, five hundred twenty".