20650664 has 32 divisors (see below), whose sum is σ = 39964320. Its totient is φ = 9998016.

The previous prime is 20650661. The next prime is 20650667. The reversal of 20650664 is 46605602.

It is an interprime number because it is at equal distance from previous prime (20650661) and next prime (20650667).

It is not an unprimeable number, because it can be changed into a prime (20650661) 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, 59339 + ... + 59685.

It is an arithmetic number, because the mean of its divisors is an integer number (1248885).

Almost surely, 2^20650664 is an apocalyptic number.

It is an amenable number.

20650664 is a deficient number, since it is larger than the sum of its proper divisors (19313656).

20650664 is a wasteful number, since it uses less digits than its factorization.

20650664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20650664 is about 4544.3001661422. The cubic root of 20650664 is about 274.3540276067.

The spelling of 20650664 in words is "twenty million, six hundred fifty thousand, six hundred sixty-four".