20772666 has 32 divisors (see below), whose sum is σ = 47654400. Its totient is φ = 6700320.

The previous prime is 20772641. The next prime is 20772667. The reversal of 20772666 is 66627702.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20772666.

It is not an unprimeable number, because it can be changed into a prime (20772667) 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, 4531 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (1489200).

Almost surely, 2^20772666 is an apocalyptic number.

20772666 is an abundant number, since it is smaller than the sum of its proper divisors (26881734).

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

20772666 is a wasteful number, since it uses less digits than its factorization.

20772666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12451 (or 12445 counting only the distinct ones).

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

The square root of 20772666 is about 4557.7040272488. The cubic root of 20772666 is about 274.8932522326.

The spelling of 20772666 in words is "twenty million, seven hundred seventy-two thousand, six hundred sixty-six".