20651465 has 4 divisors (see below), whose sum is σ = 24781764. Its totient is φ = 16521168.

The previous prime is 20651453. The next prime is 20651473. The reversal of 20651465 is 56415602.

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 3701776 + 16949689 = 1924^2 + 4117^2 .

It is a cyclic number.

It is not a de Polignac number, because 20651465 - 2¹⁴ = 20635081 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, 2065142 + ... + 2065151.

It is an arithmetic number, because the mean of its divisors is an integer number (6195441).

Almost surely, 2^20651465 is an apocalyptic number.

It is an amenable number.

20651465 is a deficient number, since it is larger than the sum of its proper divisors (4130299).

20651465 is an equidigital number, since it uses as much as digits as its factorization.

20651465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130298.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20651465 is about 4544.3882976700. The cubic root of 20651465 is about 274.3575747846.

The spelling of 20651465 in words is "twenty million, six hundred fifty-one thousand, four hundred sixty-five".