20423402524 has 48 divisors (see below), whose sum is σ = 42208488448. Its totient is φ = 8464004928.

The previous prime is 20423402459. The next prime is 20423402533. The reversal of 20423402524 is 42520432402.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20423402492 and 20423402501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108397 + ... + 229339.

Almost surely, 2^20423402524 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 20423402524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21104244224).

20423402524 is an abundant number, since it is smaller than the sum of its proper divisors (21785085924).

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

20423402524 is a wasteful number, since it uses less digits than its factorization.

20423402524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121154 (or 121152 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 28.

Adding to 20423402524 its reverse (42520432402), we get a palindrome (62943834926).

The spelling of 20423402524 in words is "twenty billion, four hundred twenty-three million, four hundred two thousand, five hundred twenty-four".