20726664 has 32 divisors (see below), whose sum is σ = 59219520. Its totient is φ = 5921856.

The previous prime is 20726653. The next prime is 20726681. The reversal of 20726664 is 46662702.

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, 61519 + ... + 61854.

It is an arithmetic number, because the mean of its divisors is an integer number (1850610).

Almost surely, 2^20726664 is an apocalyptic number.

20726664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20726664 is an abundant number, since it is smaller than the sum of its proper divisors (38492856).

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

20726664 is a wasteful number, since it uses less digits than its factorization.

20726664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123389 (or 123385 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20726664 is about 4552.6546102247. The cubic root of 20726664 is about 274.6901811123.

The spelling of 20726664 in words is "twenty million, seven hundred twenty-six thousand, six hundred sixty-four".