20715969 has 4 divisors (see below), whose sum is σ = 27621296. Its totient is φ = 13810644.

The previous prime is 20715941. The next prime is 20715973. The reversal of 20715969 is 96951702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20715969 - 2⁸ = 20715713 is a prime.

It is a super-2 number, since 2×20715969² = 858302743217922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20715169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3452659 + ... + 3452664.

It is an arithmetic number, because the mean of its divisors is an integer number (6905324).

Almost surely, 2^20715969 is an apocalyptic number.

It is an amenable number.

20715969 is a deficient number, since it is larger than the sum of its proper divisors (6905327).

20715969 is an equidigital number, since it uses as much as digits as its factorization.

20715969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905326.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20715969 is about 4551.4798692293. The cubic root of 20715969 is about 274.6429260895.

The spelling of 20715969 in words is "twenty million, seven hundred fifteen thousand, nine hundred sixty-nine".