20169925 has 12 divisors (see below), whose sum is σ = 26327680. Its totient is φ = 15286320.

The previous prime is 20169923. The next prime is 20169931. The reversal of 20169925 is 52996102.

It is not a de Polignac number, because 20169925 - 2¹ = 20169923 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20757 + ... + 21706.

Almost surely, 2^20169925 is an apocalyptic number.

20169925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20169925 is a deficient number, since it is larger than the sum of its proper divisors (6157755).

20169925 is a wasteful number, since it uses less digits than its factorization.

20169925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42492 (or 42487 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20169925 is about 4491.0939647262. The cubic root of 20169925 is about 272.2083404154.

The spelling of 20169925 in words is "twenty million, one hundred sixty-nine thousand, nine hundred twenty-five".