20864358025 has 27 divisors (see below), whose sum is σ = 30103066119. Its totient is φ = 14303521680.

The previous prime is 20864358013. The next prime is 20864358113. The reversal of 20864358025 is 52085346802.

The square root of 20864358025 is 144445.

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

It can be written as a sum of positive squares in only one way, i.e., 7511168889 + 13353189136 = 86667^2 + 115556^2 .

It is not a de Polignac number, because 20864358025 - 2⁵ = 20864357993 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5053512 + ... + 5057638.

Almost surely, 2^20864358025 is an apocalyptic number.

20864358025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20864358025 is the 144445-th square number.

20864358025 is the 72223-rd centered octagonal number.

It is an amenable number.

20864358025 is a deficient number, since it is larger than the sum of its proper divisors (9238708094).

20864358025 is an frugal number, since it uses more digits than its factorization.

20864358025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 20864358025 in words is "twenty billion, eight hundred sixty-four million, three hundred fifty-eight thousand, twenty-five".