20456580 has 48 divisors (see below), whose sum is σ = 57496320. Its totient is φ = 5434368.

The previous prime is 20456573. The next prime is 20456587. The reversal of 20456580 is 8565402.

It is an interprime number because it is at equal distance from previous prime (20456573) and next prime (20456587).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20456587) 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, 21556 + ... + 22484.

It is an arithmetic number, because the mean of its divisors is an integer number (1197840).

Almost surely, 2^20456580 is an apocalyptic number.

20456580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456580 is an abundant number, since it is smaller than the sum of its proper divisors (37039740).

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

20456580 is a wasteful number, since it uses less digits than its factorization.

20456580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20456580 is about 4522.8950905366. The cubic root of 20456580 is about 273.4918209685.

The spelling of 20456580 in words is "twenty million, four hundred fifty-six thousand, five hundred eighty".