20621534404 has 27 divisors (see below), whose sum is σ = 38097084207. Its totient is φ = 9765510408.

The previous prime is 20621534393. The next prime is 20621534411. The reversal of 20621534404 is 40443512602.

The square root of 20621534404 is 143602.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5454987 + ... + 5458765.

Almost surely, 2^20621534404 is an apocalyptic number.

20621534404 is the 143602-nd square number.

It is an amenable number.

20621534404 is a deficient number, since it is larger than the sum of its proper divisors (17475549803).

20621534404 is an frugal number, since it uses more digits than its factorization.

20621534404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600 (or 3800 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

It can be divided in two parts, 20621 and 534404, that added together give a square (555025 = 745²).

The spelling of 20621534404 in words is "twenty billion, six hundred twenty-one million, five hundred thirty-four thousand, four hundred four".