20461572 has 48 divisors (see below), whose sum is σ = 53726400. Its totient is φ = 6817608.

The previous prime is 20461547. The next prime is 20461579. The reversal of 20461572 is 27516402.

It is a super-2 number, since 2×20461572² = 837351857422368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20461579) 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, 7579 + ... + 9917.

It is an arithmetic number, because the mean of its divisors is an integer number (1119300).

Almost surely, 2^20461572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20461572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26863200).

20461572 is an abundant number, since it is smaller than the sum of its proper divisors (33264828).

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

20461572 is an equidigital number, since it uses as much as digits as its factorization.

20461572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364 (or 2344 counting only the distinct ones).

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

The square root of 20461572 is about 4523.4469157933. The cubic root of 20461572 is about 273.5140658098.

Adding to 20461572 its reverse (27516402), we get a palindrome (47977974).

It can be divided in two parts, 204 and 61572, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 20461572 in words is "twenty million, four hundred sixty-one thousand, five hundred seventy-two".