20937666 has 16 divisors (see below), whose sum is σ = 41976000. Its totient is φ = 6962448.

The previous prime is 20937661. The next prime is 20937691. The reversal of 20937666 is 66673902.

It is not an unprimeable number, because it can be changed into a prime (20937661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (2623500).

Almost surely, 2^20937666 is an apocalyptic number.

20937666 is an abundant number, since it is smaller than the sum of its proper divisors (21038334).

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

20937666 is a wasteful number, since it uses less digits than its factorization.

20937666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393.

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 20937666 is about 4575.7694434925. The cubic root of 20937666 is about 275.6191712611.

The spelling of 20937666 in words is "twenty million, nine hundred thirty-seven thousand, six hundred sixty-six".