225691020 has 36 divisors (see below), whose sum is σ = 684596640. Its totient is φ = 60184224.

The previous prime is 225690991. The next prime is 225691043. The reversal of 225691020 is 20196522.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626740 + ... + 627099.

Almost surely, 2^225691020 is an apocalyptic number.

225691020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225691020 is an abundant number, since it is smaller than the sum of its proper divisors (458905620).

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

225691020 is a wasteful number, since it uses less digits than its factorization.

225691020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253854 (or 1253849 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 225691020 is about 15023.0163416006. The cubic root of 225691020 is about 608.8422185020.

The spelling of 225691020 in words is "two hundred twenty-five million, six hundred ninety-one thousand, twenty".