20447570025 has 27 divisors (see below), whose sum is σ = 36627712069. Its totient is φ = 10904226720.

The previous prime is 20447569931. The next prime is 20447570053. The reversal of 20447570025 is 52007574402.

It is a happy number.

The square root of 20447570025 is 142995.

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

20447570025 is a `hidden beast` number, since 20 + 4 + 47 + 570 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4770526761 + 15677043264 = 69069^2 + 125208^2 .

It is not a de Polignac number, because 20447570025 - 2²⁹ = 19910699113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2140159 + ... + 2149691.

Almost surely, 2^20447570025 is an apocalyptic number.

20447570025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20447570025 is the 142995-th square number.

20447570025 is the 71498-th centered octagonal number.

It is an amenable number.

20447570025 is a deficient number, since it is larger than the sum of its proper divisors (16180142044).

20447570025 is an frugal number, since it uses more digits than its factorization.

20447570025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19082 (or 9541 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

Multiplying 20447570025 by its sum of digits (36), we get a square (736112520900 = 857970²).

The spelling of 20447570025 in words is "twenty billion, four hundred forty-seven million, five hundred seventy thousand, twenty-five".