20372490 has 48 divisors (see below), whose sum is σ = 54270216. Its totient is φ = 5299200.

The previous prime is 20372483. The next prime is 20372491. The reversal of 20372490 is 9427302.

It can be written as a sum of positive squares in 4 ways, for example, as 8696601 + 11675889 = 2949^2 + 3417^2 .

It is not an unprimeable number, because it can be changed into a prime (20372491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 930 + ... + 6450.

Almost surely, 2^20372490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20372490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27135108).

20372490 is an abundant number, since it is smaller than the sum of its proper divisors (33897726).

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

20372490 is a wasteful number, since it uses less digits than its factorization.

20372490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5575 (or 5572 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20372490 is about 4513.5894806684. The cubic root of 20372490 is about 273.1165625497.

Adding to 20372490 its reverse (9427302), we get a palindrome (29799792).

The spelling of 20372490 in words is "twenty million, three hundred seventy-two thousand, four hundred ninety".