20881695025 has 9 divisors (see below), whose sum is σ = 25894197793. Its totient is φ = 16704778000.

The previous prime is 20881694929. The next prime is 20881695049. The reversal of 20881695025 is 52059618802.

The square root of 20881695025 is 144505.

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

It can be written as a sum of positive squares in 4 ways, for example, as 7282403569 + 13599291456 = 85337^2 + 116616^2 .

It is not a de Polignac number, because 20881695025 - 2²¹ = 20879597873 is a prime.

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, 708075 + ... + 736975.

Almost surely, 2^20881695025 is an apocalyptic number.

20881695025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20881695025 is the 144505-th square number.

20881695025 is the 72253-rd centered octagonal number.

It is an amenable number.

20881695025 is a deficient number, since it is larger than the sum of its proper divisors (5012502768).

20881695025 is an frugal number, since it uses more digits than its factorization.

20881695025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57812 (or 28906 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 20881695025 in words is "twenty billion, eight hundred eighty-one million, six hundred ninety-five thousand, twenty-five".