20720679 has 24 divisors (see below), whose sum is σ = 33182208. Its totient is φ = 11455920.

The previous prime is 20720653. The next prime is 20720681. The reversal of 20720679 is 97602702.

It is not a de Polignac number, because 20720679 - 2⁷ = 20720551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2284 + ... + 6830.

It is an arithmetic number, because the mean of its divisors is an integer number (1382592).

Almost surely, 2^20720679 is an apocalyptic number.

20720679 is a deficient number, since it is larger than the sum of its proper divisors (12461529).

20720679 is a wasteful number, since it uses less digits than its factorization.

20720679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595 (or 4588 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20720679 is about 4551.9972539535. The cubic root of 20720679 is about 274.6637388606.

The spelling of 20720679 in words is "twenty million, seven hundred twenty thousand, six hundred seventy-nine".