25817020620 has 24 divisors (see below), whose sum is σ = 72287657904. Its totient is φ = 6884538816.

The previous prime is 25817020597. The next prime is 25817020631. The reversal of 25817020620 is 2602071852.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215141779 + ... + 215141898.

It is an arithmetic number, because the mean of its divisors is an integer number (3011985746).

Almost surely, 2^25817020620 is an apocalyptic number.

25817020620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25817020620 is an abundant number, since it is smaller than the sum of its proper divisors (46470637284).

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

25817020620 is a wasteful number, since it uses less digits than its factorization.

25817020620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430283689 (or 430283687 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 25817020620 in words is "twenty-five billion, eight hundred seventeen million, twenty thousand, six hundred twenty".