20531404 has 6 divisors (see below), whose sum is σ = 35929964. Its totient is φ = 10265700.

The previous prime is 20531353. The next prime is 20531417. The reversal of 20531404 is 40413502.

It is a super-2 number, since 2×20531404² = 843077100422432, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2566422 + ... + 2566429.

Almost surely, 2^20531404 is an apocalyptic number.

It is an amenable number.

20531404 is a deficient number, since it is larger than the sum of its proper divisors (15398560).

20531404 is a wasteful number, since it uses less digits than its factorization.

20531404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132855 (or 5132853 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20531404 is about 4531.1592335737. The cubic root of 20531404 is about 273.8248654381.

Adding to 20531404 its reverse (40413502), we get a palindrome (60944906).

The spelling of 20531404 in words is "twenty million, five hundred thirty-one thousand, four hundred four".