22020402420 has 144 divisors (see below), whose sum is σ = 69399570240. Its totient is φ = 5861051136.

The previous prime is 22020402367. The next prime is 22020402427. The reversal of 22020402420 is 2420402022.

22020402420 is a `hidden beast` number, since 2 + 202 + 0 + 40 + 2 + 420 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 22020402393 and 22020402402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020402427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2761359 + ... + 2769321.

It is an arithmetic number, because the mean of its divisors is an integer number (481941460).

Almost surely, 2^22020402420 is an apocalyptic number.

22020402420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22020402420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34699785120).

22020402420 is an abundant number, since it is smaller than the sum of its proper divisors (47379167820).

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

22020402420 is a wasteful number, since it uses less digits than its factorization.

22020402420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8556 (or 8542 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 22020402420 its reverse (2420402022), we get a palindrome (24440804442).

The spelling of 22020402420 in words is "twenty-two billion, twenty million, four hundred two thousand, four hundred twenty".