20404432 has 10 divisors (see below), whose sum is σ = 39533618. Its totient is φ = 10202208.

The previous prime is 20404421. The next prime is 20404441. The reversal of 20404432 is 23440402.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 1948816 = 4296^2 + 1396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637623 + ... + 637654.

Almost surely, 2^20404432 is an apocalyptic number.

It is an amenable number.

20404432 is a deficient number, since it is larger than the sum of its proper divisors (19129186).

20404432 is a wasteful number, since it uses less digits than its factorization.

20404432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275285 (or 1275279 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20404432 is about 4517.1265202560. The cubic root of 20404432 is about 273.2592277127.

Adding to 20404432 its reverse (23440402), we get a palindrome (43844834).

The spelling of 20404432 in words is "twenty million, four hundred four thousand, four hundred thirty-two".