20769564 has 12 divisors (see below), whose sum is σ = 48462344. Its totient is φ = 6923184.

The previous prime is 20769547. The next prime is 20769571. The reversal of 20769564 is 46596702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865387 + ... + 865410.

Almost surely, 2^20769564 is an apocalyptic number.

It is an amenable number.

20769564 is an abundant number, since it is smaller than the sum of its proper divisors (27692780).

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

20769564 is a wasteful number, since it uses less digits than its factorization.

20769564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730804 (or 1730802 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 20769564 is about 4557.3637116210. The cubic root of 20769564 is about 274.8795682032.

The spelling of 20769564 in words is "twenty million, seven hundred sixty-nine thousand, five hundred sixty-four".