19893692025 has 27 divisors (see below), whose sum is σ = 35635602639. Its totient is φ = 10608840720.

The previous prime is 19893691949. The next prime is 19893692033. The reversal of 19893692025 is 52029639891.

It is a happy number.

The square root of 19893692025 is 141045.

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., 7161729129 + 12731962896 = 84627^2 + 112836^2 .

It is not a de Polignac number, because 19893692025 - 2⁷ = 19893691897 is a prime.

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, 2110974 + ... + 2120376.

Almost surely, 2^19893692025 is an apocalyptic number.

19893692025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19893692025 is the 141045-th square number.

19893692025 is the 70523-rd centered octagonal number.

It is an amenable number.

19893692025 is a deficient number, since it is larger than the sum of its proper divisors (15741910614).

19893692025 is an frugal number, since it uses more digits than its factorization.

19893692025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18822 (or 9411 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 19893692025 in words is "nineteen billion, eight hundred ninety-three million, six hundred ninety-two thousand, twenty-five".