20165420025 has 27 divisors (see below), whose sum is σ = 36122323471. Its totient is φ = 10753754640.

The previous prime is 20165420003. The next prime is 20165420029. The reversal of 20165420025 is 52002456102.

The square root of 20165420025 is 142005.

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

20165420025 is a `hidden beast` number, since 2 + 0 + 1 + 654 + 2 + 0 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7259551209 + 12905868816 = 85203^2 + 113604^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20165420025 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20165420029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2125342 + ... + 2134808.

Almost surely, 2^20165420025 is an apocalyptic number.

20165420025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20165420025 is the 142005-th square number.

20165420025 is the 71003-rd centered octagonal number.

It is an amenable number.

20165420025 is a deficient number, since it is larger than the sum of its proper divisors (15956903446).

20165420025 is an frugal number, since it uses more digits than its factorization.

20165420025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18950 (or 9475 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20165420025 its reverse (52002456102), we get a palindrome (72167876127).

The spelling of 20165420025 in words is "twenty billion, one hundred sixty-five million, four hundred twenty thousand, twenty-five".