20461560 has 64 divisors (see below), whose sum is σ = 70156800. Its totient is φ = 4676736.

The previous prime is 20461547. The next prime is 20461579. The reversal of 20461560 is 6516402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20461560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11340 + ... + 13019.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^20461560 is an apocalyptic number.

20461560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20461560 is an abundant number, since it is smaller than the sum of its proper divisors (49695240).

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

20461560 is a wasteful number, since it uses less digits than its factorization.

20461560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24380 (or 24376 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20461560 is about 4523.4455893710. The cubic root of 20461560 is about 273.5140123410.

Adding to 20461560 its reverse (6516402), we get a palindrome (26977962).

The spelling of 20461560 in words is "twenty million, four hundred sixty-one thousand, five hundred sixty".