20779406 has 32 divisors (see below), whose sum is σ = 34471008. Its totient is φ = 9354240.

The previous prime is 20779397. The next prime is 20779411. The reversal of 20779406 is 60497702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89066 + ... + 89298.

It is an arithmetic number, because the mean of its divisors is an integer number (1077219).

Almost surely, 2^20779406 is an apocalyptic number.

20779406 is a deficient number, since it is larger than the sum of its proper divisors (13691602).

20779406 is a wasteful number, since it uses less digits than its factorization.

20779406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20779406 is about 4558.4433746620. The cubic root of 20779406 is about 274.9229800838.

The spelling of 20779406 in words is "twenty million, seven hundred seventy-nine thousand, four hundred six".