20531025 has 18 divisors (see below), whose sum is σ = 36773750. Its totient is φ = 10949760.

The previous prime is 20531023. The next prime is 20531059. The reversal of 20531025 is 52013502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 254016 + 20277009 = 504^2 + 4503^2 .

It is not a de Polignac number, because 20531025 - 2¹ = 20531023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20530989 and 20531007.

It is not an unprimeable number, because it can be changed into a prime (20531023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45400 + ... + 45849.

Almost surely, 2^20531025 is an apocalyptic number.

20531025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20531025 is a deficient number, since it is larger than the sum of its proper divisors (16242725).

20531025 is a wasteful number, since it uses less digits than its factorization.

20531025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91265 (or 91257 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20531025 is about 4531.1174118533. The cubic root of 20531025 is about 273.8231805353.

Adding to 20531025 its reverse (52013502), we get a palindrome (72544527).

The spelling of 20531025 in words is "twenty million, five hundred thirty-one thousand, twenty-five".