20233640025 has 135 divisors (see below), whose sum is σ = 39176047911. Its totient is φ = 10323573120.

The previous prime is 20233639957. The next prime is 20233640039. The reversal of 20233640025 is 52004633202.

The square root of 20233640025 is 142245.

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

20233640025 is a `hidden beast` number, since 2 + 0 + 233 + 6 + 400 + 25 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 8405772489 + 11827867536 = 91683^2 + 108756^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 20233640025 - 2¹³ = 20233631833 is a prime.

It is a super-2 number, since 2×20233640025² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 185629671 + ... + 185629779.

Almost surely, 2^20233640025 is an apocalyptic number.

20233640025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20233640025 is the 142245-th square number.

20233640025 is the 71123-rd centered octagonal number.

It is an amenable number.

20233640025 is a deficient number, since it is larger than the sum of its proper divisors (18942407886).

20233640025 is an equidigital number, since it uses as much as digits as its factorization.

20233640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The spelling of 20233640025 in words is "twenty billion, two hundred thirty-three million, six hundred forty thousand, twenty-five".