25122420 has 48 divisors (see below), whose sum is σ = 78160320. Its totient is φ = 6699168.

The previous prime is 25122403. The next prime is 25122451. The reversal of 25122420 is 2422152.

It is a super-2 number, since 2×25122420² = 1262271973312800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25122393 and 25122402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22722 + ... + 23801.

It is an arithmetic number, because the mean of its divisors is an integer number (1628340).

Almost surely, 2^25122420 is an apocalyptic number.

25122420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25122420 is an abundant number, since it is smaller than the sum of its proper divisors (53037900).

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

25122420 is a wasteful number, since it uses less digits than its factorization.

25122420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46541 (or 46533 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25122420 is about 5012.2270499250. The cubic root of 25122420 is about 292.8782745580.

Adding to 25122420 its reverse (2422152), we get a palindrome (27544572).

The spelling of 25122420 in words is "twenty-five million, one hundred twenty-two thousand, four hundred twenty".