20779408 has 20 divisors (see below), whose sum is σ = 43357468. Its totient is φ = 9590400.

The previous prime is 20779397. The next prime is 20779411. The reversal of 20779408 is 80497702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12759184 + 8020224 = 3572^2 + 2832^2 .

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, 49743 + ... + 50158.

Almost surely, 2^20779408 is an apocalyptic number.

It is an amenable number.

20779408 is an abundant number, since it is smaller than the sum of its proper divisors (22578060).

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

20779408 is a wasteful number, since it uses less digits than its factorization.

20779408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99922 (or 99916 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20779408 is about 4558.4435940351. The cubic root of 20779408 is about 274.9229889041.

The spelling of 20779408 in words is "twenty million, seven hundred seventy-nine thousand, four hundred eight".