20404252 has 24 divisors (see below), whose sum is σ = 41005440. Its totient is φ = 8786160.

The previous prime is 20404249. The next prime is 20404261. The reversal of 20404252 is 25240402.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11368 + ... + 13039.

It is an arithmetic number, because the mean of its divisors is an integer number (1708560).

Almost surely, 2^20404252 is an apocalyptic number.

20404252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20404252 is an abundant number, since it is smaller than the sum of its proper divisors (20601188).

20404252 is a wasteful number, since it uses less digits than its factorization.

20404252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24441 (or 24439 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20404252 is about 4517.1065960413. The cubic root of 20404252 is about 273.2584241813.

Adding to 20404252 its reverse (25240402), we get a palindrome (45644654).

The spelling of 20404252 in words is "twenty million, four hundred four thousand, two hundred fifty-two".