20218860 has 36 divisors (see below), whose sum is σ = 61331088. Its totient is φ = 5391648.

The previous prime is 20218859. The next prime is 20218867. The reversal of 20218860 is 6881202.

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

It is not an unprimeable number, because it can be changed into a prime (20218867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55984 + ... + 56343.

Almost surely, 2^20218860 is an apocalyptic number.

20218860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20218860 is an abundant number, since it is smaller than the sum of its proper divisors (41112228).

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

20218860 is a wasteful number, since it uses less digits than its factorization.

20218860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112342 (or 112337 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20218860 is about 4496.5386687985. The cubic root of 20218860 is about 272.4283008626.

The spelling of 20218860 in words is "twenty million, two hundred eighteen thousand, eight hundred sixty".