25660020 has 48 divisors (see below), whose sum is σ = 72067968. Its totient is φ = 6821760.

The previous prime is 25660009. The next prime is 25660027. The reversal of 25660020 is 2006652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25660027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38490 + ... + 39150.

It is an arithmetic number, because the mean of its divisors is an integer number (1501416).

Almost surely, 2^25660020 is an apocalyptic number.

25660020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25660020 is an abundant number, since it is smaller than the sum of its proper divisors (46407948).

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

25660020 is a wasteful number, since it uses less digits than its factorization.

25660020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 25660020 is about 5065.5720308767. The cubic root of 25660020 is about 294.9526688404.

Adding to 25660020 its reverse (2006652), we get a palindrome (27666672).

The spelling of 25660020 in words is "twenty-five million, six hundred sixty thousand, twenty".