20420421432 has 64 divisors (see below), whose sum is σ = 52737484800. Its totient is φ = 6582280320.

The previous prime is 20420421367. The next prime is 20420421433. The reversal of 20420421432 is 23412402402.

It is a super-2 number, since 2×20420421432² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420421433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1053573 + ... + 1072779.

It is an arithmetic number, because the mean of its divisors is an integer number (824023200).

Almost surely, 2^20420421432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420421432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26368742400).

20420421432 is an abundant number, since it is smaller than the sum of its proper divisors (32317063368).

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

20420421432 is a wasteful number, since it uses less digits than its factorization.

20420421432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20676 (or 20672 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20420421432 its reverse (23412402402), we get a palindrome (43832823834).

The spelling of 20420421432 in words is "twenty billion, four hundred twenty million, four hundred twenty-one thousand, four hundred thirty-two".