20421423022 has 64 divisors (see below), whose sum is σ = 43293196800. Its totient is φ = 6957809280.

The previous prime is 20421423017. The next prime is 20421423031. The reversal of 20421423022 is 22032412402.

It is a super-2 number, since 2×20421423022² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20421422984 and 20421423002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230397 + ... + 306472.

It is an arithmetic number, because the mean of its divisors is an integer number (676456200).

Almost surely, 2^20421423022 is an apocalyptic number.

20421423022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20421423022 is an abundant number, since it is smaller than the sum of its proper divisors (22871773778).

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

20421423022 is a wasteful number, since it uses less digits than its factorization.

20421423022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536921.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20421423022 its reverse (22032412402), we get a palindrome (42453835424).

The spelling of 20421423022 in words is "twenty billion, four hundred twenty-one million, four hundred twenty-three thousand, twenty-two".