20451125 has 32 divisors (see below), whose sum is σ = 27456000. Its totient is φ = 15163200.

The previous prime is 20451113. The next prime is 20451127. The reversal of 20451125 is 52115402.

It is not a de Polignac number, because 20451125 - 2¹⁸ = 20188981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20451097 and 20451106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187571 + ... + 187679.

It is an arithmetic number, because the mean of its divisors is an integer number (858000).

Almost surely, 2^20451125 is an apocalyptic number.

20451125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20451125 is a deficient number, since it is larger than the sum of its proper divisors (7004875).

20451125 is a wasteful number, since it uses less digits than its factorization.

20451125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20451125 is about 4522.2920073786. The cubic root of 20451125 is about 273.4675088154.

Adding to 20451125 its reverse (52115402), we get a palindrome (72566527).

The spelling of 20451125 in words is "twenty million, four hundred fifty-one thousand, one hundred twenty-five".