20465720 has 64 divisors (see below), whose sum is σ = 50703840. Its totient is φ = 7372800.

The previous prime is 20465719. The next prime is 20465723. The reversal of 20465720 is 2756402.

It is a self number, because there is not a number n which added to its sum of digits gives 20465720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84800 + ... + 85040.

Almost surely, 2^20465720 is an apocalyptic number.

20465720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20465720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25351920).

20465720 is an abundant number, since it is smaller than the sum of its proper divisors (30238120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20465720 is a wasteful number, since it uses less digits than its factorization.

20465720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20465720 is about 4523.9053924679. The cubic root of 20465720 is about 273.5325469524.

The spelling of 20465720 in words is "twenty million, four hundred sixty-five thousand, seven hundred twenty".