25551620 has 24 divisors (see below), whose sum is σ = 55992384. Its totient is φ = 9776096.

The previous prime is 25551613. The next prime is 25551623. The reversal of 25551620 is 2615552.

It is a self number, because there is not a number n which added to its sum of digits gives 25551620.

It is not an unprimeable number, because it can be changed into a prime (25551623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27314 + ... + 28233.

It is an arithmetic number, because the mean of its divisors is an integer number (2333016).

Almost surely, 2^25551620 is an apocalyptic number.

25551620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25551620 is an abundant number, since it is smaller than the sum of its proper divisors (30440764).

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

25551620 is a wasteful number, since it uses less digits than its factorization.

25551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55579 (or 55577 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 25551620 is about 5054.8610267741. The cubic root of 25551620 is about 294.5367429749.

The spelling of 25551620 in words is "twenty-five million, five hundred fifty-one thousand, six hundred twenty".