20500580 has 12 divisors (see below), whose sum is σ = 43051260. Its totient is φ = 8200224.

The previous prime is 20500577. The next prime is 20500591. The reversal of 20500580 is 8500502.

It can be written as a sum of positive squares in 2 ways, for example, as 13823524 + 6677056 = 3718^2 + 2584^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1025029 = 20500580 / (2 + 0 + 5 + 0 + 0 + 5 + 8 + 0).

It is a congruent 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, 512495 + ... + 512534.

It is an arithmetic number, because the mean of its divisors is an integer number (3587605).

Almost surely, 2^20500580 is an apocalyptic number.

20500580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20500580 is an abundant number, since it is smaller than the sum of its proper divisors (22550680).

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

20500580 is a wasteful number, since it uses less digits than its factorization.

20500580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025038 (or 1025036 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20500580 is about 4527.7566189008. The cubic root of 20500580 is about 273.6877648116.

The spelling of 20500580 in words is "twenty million, five hundred thousand, five hundred eighty".