20408025 has 48 divisors (see below), whose sum is σ = 38122560. Its totient is φ = 9542400.

The previous prime is 20407997. The next prime is 20408029. The reversal of 20408025 is 52080402.

It is not a de Polignac number, because 20408025 - 2⁵ = 20407993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20407992 and 20408010.

It is not an unprimeable number, because it can be changed into a prime (20408029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23499 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (794220).

Almost surely, 2^20408025 is an apocalyptic number.

20408025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20408025 is a deficient number, since it is larger than the sum of its proper divisors (17714535).

20408025 is a wasteful number, since it uses less digits than its factorization.

20408025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 20408025 is about 4517.5242113352. The cubic root of 20408025 is about 273.2752661038.

Adding to 20408025 its reverse (52080402), we get a palindrome (72488427).

The spelling of 20408025 in words is "twenty million, four hundred eight thousand, twenty-five".