20421214220 has 48 divisors (see below), whose sum is σ = 46840405248. Its totient is φ = 7416807360.

The previous prime is 20421214213. The next prime is 20421214241. The reversal of 20421214220 is 2241212402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20421214192 and 20421214201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124667 + ... + 237453.

It is an arithmetic number, because the mean of its divisors is an integer number (975841776).

Almost surely, 2^20421214220 is an apocalyptic number.

20421214220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421214220 is an abundant number, since it is smaller than the sum of its proper divisors (26419191028).

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

20421214220 is a wasteful number, since it uses less digits than its factorization.

20421214220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113630 (or 113628 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20421214220 its reverse (2241212402), we get a palindrome (22662426622).

The spelling of 20421214220 in words is "twenty billion, four hundred twenty-one million, two hundred fourteen thousand, two hundred twenty".