20668072 has 16 divisors (see below), whose sum is σ = 40003200. Its totient is φ = 10000560.

The previous prime is 20668069. The next prime is 20668091. The reversal of 20668072 is 27086602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41422 + ... + 41917.

It is an arithmetic number, because the mean of its divisors is an integer number (2500200).

Almost surely, 2^20668072 is an apocalyptic number.

It is an amenable number.

20668072 is a deficient number, since it is larger than the sum of its proper divisors (19335128).

20668072 is a wasteful number, since it uses less digits than its factorization.

20668072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83376 (or 83372 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20668072 is about 4546.2151290937. The cubic root of 20668072 is about 274.4310971792.

The spelling of 20668072 in words is "twenty million, six hundred sixty-eight thousand, seventy-two".