20939667 has 16 divisors (see below), whose sum is σ = 32651520. Its totient is φ = 11686752.

The previous prime is 20939657. The next prime is 20939671. The reversal of 20939667 is 76693902.

It is not a de Polignac number, because 20939667 - 2⁶ = 20939603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20939627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10692 + ... + 12497.

It is an arithmetic number, because the mean of its divisors is an integer number (2040720).

Almost surely, 2^20939667 is an apocalyptic number.

20939667 is a deficient number, since it is larger than the sum of its proper divisors (11711853).

20939667 is a wasteful number, since it uses less digits than its factorization.

20939667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23242.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 20939667 is about 4575.9880900195. The cubic root of 20939667 is about 275.6279512336.

The spelling of 20939667 in words is "twenty million, nine hundred thirty-nine thousand, six hundred sixty-seven".