20726465 has 4 divisors (see below), whose sum is σ = 24871764. Its totient is φ = 16581168.

The previous prime is 20726441. The next prime is 20726471. The reversal of 20726465 is 56462702.

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 6195121 + 14531344 = 2489^2 + 3812^2 .

It is a cyclic number.

It is not a de Polignac number, because 20726465 - 2¹⁸ = 20464321 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, 2072642 + ... + 2072651.

It is an arithmetic number, because the mean of its divisors is an integer number (6217941).

Almost surely, 2^20726465 is an apocalyptic number.

It is an amenable number.

20726465 is a deficient number, since it is larger than the sum of its proper divisors (4145299).

20726465 is an equidigital number, since it uses as much as digits as its factorization.

20726465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145298.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20726465 is about 4552.6327547915. The cubic root of 20726465 is about 274.6893019948.

The spelling of 20726465 in words is "twenty million, seven hundred twenty-six thousand, four hundred sixty-five".