20669667 has 16 divisors (see below), whose sum is σ = 28212480. Its totient is φ = 13456800.

The previous prime is 20669659. The next prime is 20669669. The reversal of 20669667 is 76696602.

It is not a de Polignac number, because 20669667 - 2³ = 20669659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20669669) 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, 32442 + ... + 33072.

It is an arithmetic number, because the mean of its divisors is an integer number (1763280).

Almost surely, 2^20669667 is an apocalyptic number.

20669667 is a deficient number, since it is larger than the sum of its proper divisors (7542813).

20669667 is a wasteful number, since it uses less digits than its factorization.

20669667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 20669667 is about 4546.3905463565. The cubic root of 20669667 is about 274.4381564788.

The spelling of 20669667 in words is "twenty million, six hundred sixty-nine thousand, six hundred sixty-seven".