20285880 has 32 divisors (see below), whose sum is σ = 60858000. Its totient is φ = 5409536.

The previous prime is 20285869. The next prime is 20285893. The reversal of 20285880 is 8858202.

It is a congruent number.

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, 84405 + ... + 84644.

Almost surely, 2^20285880 is an apocalyptic number.

20285880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20285880 is an abundant number, since it is smaller than the sum of its proper divisors (40572120).

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

20285880 is a wasteful number, since it uses less digits than its factorization.

20285880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169063 (or 169059 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 20285880 is about 4503.9849022838. The cubic root of 20285880 is about 272.7289773631.

The spelling of 20285880 in words is "twenty million, two hundred eighty-five thousand, eight hundred eighty".