20423125 has 20 divisors (see below), whose sum is σ = 26175996. Its totient is φ = 15920000.

The previous prime is 20423087. The next prime is 20423129. The reversal of 20423125 is 52132402.

20423125 = 458² + 459² + ... + 539².

It can be written as a sum of positive squares in 10 ways, for example, as 19518724 + 904401 = 4418^2 + 951^2 .

It is not a de Polignac number, because 20423125 - 2⁹ = 20422613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25227 + ... + 26023.

Almost surely, 2^20423125 is an apocalyptic number.

20423125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20423125 is a deficient number, since it is larger than the sum of its proper divisors (5752871).

20423125 is an frugal number, since it uses more digits than its factorization.

20423125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20423125 is about 4519.1951717092. The cubic root of 20423125 is about 273.3426487340.

Adding to 20423125 its reverse (52132402), we get a palindrome (72555527).

The spelling of 20423125 in words is "twenty million, four hundred twenty-three thousand, one hundred twenty-five".