20666772 has 48 divisors (see below), whose sum is σ = 61237120. Its totient is φ = 5904576.

The previous prime is 20666759. The next prime is 20666783. The reversal of 20666772 is 27766602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12913 + ... + 14424.

Almost surely, 2^20666772 is an apocalyptic number.

It is an amenable number.

20666772 is an abundant number, since it is smaller than the sum of its proper divisors (40570348).

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

20666772 is a wasteful number, since it uses less digits than its factorization.

20666772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27357 (or 27349 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 20666772 is about 4546.0721507693. The cubic root of 20666772 is about 274.4253432494.

The spelling of 20666772 in words is "twenty million, six hundred sixty-six thousand, seven hundred seventy-two".