20717392 has 20 divisors (see below), whose sum is σ = 40353940. Its totient is φ = 10303488.

The previous prime is 20717387. The next prime is 20717399. The reversal of 20717392 is 29371702.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 11451456 = 3044^2 + 3384^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (2017697).

Almost surely, 2^20717392 is an apocalyptic number.

It is an amenable number.

20717392 is a deficient number, since it is larger than the sum of its proper divisors (19636548).

20717392 is a wasteful number, since it uses less digits than its factorization.

20717392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910 (or 6904 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20717392 is about 4551.6361893280. The cubic root of 20717392 is about 274.6492144419.

The spelling of 20717392 in words is "twenty million, seven hundred seventeen thousand, three hundred ninety-two".