25990420 has 24 divisors (see below), whose sum is σ = 54677448. Its totient is φ = 10377600.

The previous prime is 25990417. The next prime is 25990421. The reversal of 25990420 is 2409952.

It can be written as a sum of positive squares in 4 ways, for example, as 3218436 + 22771984 = 1794^2 + 4772^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990421) 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, 18130 + ... + 19510.

It is an arithmetic number, because the mean of its divisors is an integer number (2278227).

Almost surely, 2^25990420 is an apocalyptic number.

25990420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25990420 is an abundant number, since it is smaller than the sum of its proper divisors (28687028).

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

25990420 is a wasteful number, since it uses less digits than its factorization.

25990420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 25990420 is about 5098.0800307567. The cubic root of 25990420 is about 296.2132168423.

The spelling of 25990420 in words is "twenty-five million, nine hundred ninety thousand, four hundred twenty".