20972465 has 4 divisors (see below), whose sum is σ = 25166964. Its totient is φ = 16777968.

The previous prime is 20972453. The next prime is 20972473. The reversal of 20972465 is 56427902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5793649 + 15178816 = 2407^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 20972465 - 2⁴ = 20972449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097242 + ... + 2097251.

It is an arithmetic number, because the mean of its divisors is an integer number (6291741).

Almost surely, 2^20972465 is an apocalyptic number.

It is an amenable number.

20972465 is a deficient number, since it is larger than the sum of its proper divisors (4194499).

20972465 is an equidigital number, since it uses as much as digits as its factorization.

20972465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194498.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20972465 is about 4579.5703946986. The cubic root of 20972465 is about 275.7717823940.

The spelling of 20972465 in words is "twenty million, nine hundred seventy-two thousand, four hundred sixty-five".