20440672 has 24 divisors (see below), whose sum is σ = 45992016. Its totient is φ = 8760192.

The previous prime is 20440649. The next prime is 20440691. The reversal of 20440672 is 27604402.

It is a super-3 number, since 3×20440672³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45403 + ... + 45850.

It is an arithmetic number, because the mean of its divisors is an integer number (1916334).

Almost surely, 2^20440672 is an apocalyptic number.

It is an amenable number.

20440672 is an abundant number, since it is smaller than the sum of its proper divisors (25551344).

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

20440672 is an equidigital number, since it uses as much as digits as its factorization.

20440672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91270 (or 91262 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20440672 is about 4521.1361403966. The cubic root of 20440672 is about 273.4209092105.

It can be divided in two parts, 20440 and 672, that added together give a palindrome (21112).

The spelling of 20440672 in words is "twenty million, four hundred forty thousand, six hundred seventy-two".