20769816 has 16 divisors (see below), whose sum is σ = 51924600. Its totient is φ = 6923264.

The previous prime is 20769803. The next prime is 20769823. The reversal of 20769816 is 61896702.

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, 432681 + ... + 432728.

Almost surely, 2^20769816 is an apocalyptic number.

It is an amenable number.

20769816 is an abundant number, since it is smaller than the sum of its proper divisors (31154784).

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

20769816 is a wasteful number, since it uses less digits than its factorization.

20769816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865418 (or 865414 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20769816 is about 4557.3913591001. The cubic root of 20769816 is about 274.8806799160.

The spelling of 20769816 in words is "twenty million, seven hundred sixty-nine thousand, eight hundred sixteen".