20712465 has 24 divisors (see below), whose sum is σ = 36017280. Its totient is φ = 11011104.

The previous prime is 20712449. The next prime is 20712469. The reversal of 20712465 is 56421702.

It is not a de Polignac number, because 20712465 - 2⁴ = 20712449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20712469) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19416 + ... + 20454.

It is an arithmetic number, because the mean of its divisors is an integer number (1500720).

Almost surely, 2^20712465 is an apocalyptic number.

It is an amenable number.

20712465 is a deficient number, since it is larger than the sum of its proper divisors (15304815).

20712465 is a wasteful number, since it uses less digits than its factorization.

20712465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20712465 is about 4551.0949232025. The cubic root of 20712465 is about 274.6274404019.

It can be divided in two parts, 2071 and 2465, that multiplied together give a palindrome (5105015).

The spelling of 20712465 in words is "twenty million, seven hundred twelve thousand, four hundred sixty-five".