20664950 has 12 divisors (see below), whose sum is σ = 38436900. Its totient is φ = 8265960.

The previous prime is 20664947. The next prime is 20664953. The reversal of 20664950 is 5946602.

It is an interprime number because it is at equal distance from previous prime (20664947) and next prime (20664953).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206600 + ... + 206699.

It is an arithmetic number, because the mean of its divisors is an integer number (3203075).

Almost surely, 2^20664950 is an apocalyptic number.

20664950 is a deficient number, since it is larger than the sum of its proper divisors (17771950).

20664950 is a wasteful number, since it uses less digits than its factorization.

20664950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413311 (or 413306 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20664950 is about 4545.8717535804. The cubic root of 20664950 is about 274.4172784894.

It can be divided in two parts, 206 and 64950, that added together give a palindrome (65156).

The spelling of 20664950 in words is "twenty million, six hundred sixty-four thousand, nine hundred fifty".