25000020 has 36 divisors (see below), whose sum is σ = 75833940. Its totient is φ = 6666624.

The previous prime is 25000009. The next prime is 25000033. The reversal of 25000020 is 2000052.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 22297284 = 1644^2 + 4722^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 24999966 and 25000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69265 + ... + 69624.

Almost surely, 2^25000020 is an apocalyptic number.

25000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25000020 is an abundant number, since it is smaller than the sum of its proper divisors (50833920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25000020 is a wasteful number, since it uses less digits than its factorization.

25000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138904 (or 138899 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 25000020 is about 5000.0019999996. The cubic root of 25000020 is about 292.4018517951.

Subtracting from 25000020 its product of nonzero digits (20), we obtain a square (25000000 = 5000²).

Adding to 25000020 its reverse (2000052), we get a palindrome (27000072).

The spelling of 25000020 in words is "twenty-five million, twenty", and thus it is an aban number and an uban number.