20662788 has 12 divisors (see below), whose sum is σ = 48213200. Its totient is φ = 6887592.

The previous prime is 20662787. The next prime is 20662793. The reversal of 20662788 is 88726602.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20662787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860938 + ... + 860961.

Almost surely, 2^20662788 is an apocalyptic number.

It is an amenable number.

20662788 is an abundant number, since it is smaller than the sum of its proper divisors (27550412).

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

20662788 is a wasteful number, since it uses less digits than its factorization.

20662788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721906 (or 1721904 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 20662788 is about 4545.6339491868. The cubic root of 20662788 is about 274.4077081646.

The spelling of 20662788 in words is "twenty million, six hundred sixty-two thousand, seven hundred eighty-eight".