20021220108 has 36 divisors (see below), whose sum is σ = 50901749808. Its totient is φ = 6635161440.

The previous prime is 20021220101. The next prime is 20021220119. The reversal of 20021220108 is 80102212002.

It is a happy number.

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

It is a super-2 number, since 2×20021220108² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20021220101) 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, 1601128 + ... + 1613583.

Almost surely, 2^20021220108 is an apocalyptic number.

It is an amenable number.

20021220108 is an abundant number, since it is smaller than the sum of its proper divisors (30880529700).

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

20021220108 is a wasteful number, since it uses less digits than its factorization.

20021220108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214894 (or 3214889 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The spelling of 20021220108 in words is "twenty billion, twenty-one million, two hundred twenty thousand, one hundred eight".