20040972 has 96 divisors (see below), whose sum is σ = 58329600. Its totient is φ = 5225472.

The previous prime is 20040971. The next prime is 20040983. The reversal of 20040972 is 27904002.

It is not an unprimeable number, because it can be changed into a prime (20040971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46068 + ... + 46500.

It is an arithmetic number, because the mean of its divisors is an integer number (607600).

Almost surely, 2^20040972 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 20040972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29164800).

20040972 is an abundant number, since it is smaller than the sum of its proper divisors (38288628).

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

20040972 is a wasteful number, since it uses less digits than its factorization.

20040972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20040972 is about 4476.7144201970. The cubic root of 20040972 is about 271.6269937592.

Adding to 20040972 its reverse (27904002), we get a palindrome (47944974).

It can be divided in two parts, 20040 and 972, that added together give a palindrome (21012).

The spelling of 20040972 in words is "twenty million, forty thousand, nine hundred seventy-two".