20913697 has 8 divisors (see below), whose sum is σ = 24229376. Its totient is φ = 17680032.

The previous prime is 20913643. The next prime is 20913707. The reversal of 20913697 is 79631902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20913697 - 2⁷ = 20913569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20913617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19953 + ... + 20974.

It is an arithmetic number, because the mean of its divisors is an integer number (3028672).

Almost surely, 2^20913697 is an apocalyptic number.

It is an amenable number.

20913697 is a deficient number, since it is larger than the sum of its proper divisors (3315679).

20913697 is an equidigital number, since it uses as much as digits as its factorization.

20913697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41007.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20913697 is about 4573.1495711380. The cubic root of 20913697 is about 275.5139567569.

The spelling of 20913697 in words is "twenty million, nine hundred thirteen thousand, six hundred ninety-seven".