25420555 has 4 divisors (see below), whose sum is σ = 30504672. Its totient is φ = 20336440.

The previous prime is 25420531. The next prime is 25420579. The reversal of 25420555 is 55502452.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25420531) and next prime (25420579).

It is not a de Polignac number, because 25420555 - 2⁵ = 25420523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2542051 + ... + 2542060.

It is an arithmetic number, because the mean of its divisors is an integer number (7626168).

Almost surely, 2^25420555 is an apocalyptic number.

25420555 is a deficient number, since it is larger than the sum of its proper divisors (5084117).

25420555 is an equidigital number, since it uses as much as digits as its factorization.

25420555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084116.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 25420555 is about 5041.8801056749. The cubic root of 25420555 is about 294.0322785298.

The spelling of 25420555 in words is "twenty-five million, four hundred twenty thousand, five hundred fifty-five".