20420040220 has 24 divisors (see below), whose sum is σ = 42898086000. Its totient is φ = 8164968192.

The previous prime is 20420040209. The next prime is 20420040233. The reversal of 20420040220 is 2204002402.

It is a junction number, because it is equal to n+sod(n) for n = 20420040194 and 20420040203.

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, 135165 + ... + 243124.

It is an arithmetic number, because the mean of its divisors is an integer number (1787420250).

Almost surely, 2^20420040220 is an apocalyptic number.

20420040220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420040220 is an abundant number, since it is smaller than the sum of its proper divisors (22478045780).

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

20420040220 is a wasteful number, since it uses less digits than its factorization.

20420040220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380997 (or 380995 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20420040220 its reverse (2204002402), we get a palindrome (22624042622).

The spelling of 20420040220 in words is "twenty billion, four hundred twenty million, forty thousand, two hundred twenty".