20400364432 has 120 divisors (see below), whose sum is σ = 47567526912. Its totient is φ = 8442201600.

The previous prime is 20400364427. The next prime is 20400364433. The reversal of 20400364432 is 23446300402.

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

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 20400364432.

It is not an unprimeable number, because it can be changed into a prime (20400364433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18494793 + ... + 18495895.

Almost surely, 2^20400364432 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 20400364432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23783763456).

20400364432 is an abundant number, since it is smaller than the sum of its proper divisors (27167162480).

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

20400364432 is a wasteful number, since it uses less digits than its factorization.

20400364432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20400364432 its reverse (23446300402), we get a palindrome (43846664834).

The spelling of 20400364432 in words is "twenty billion, four hundred million, three hundred sixty-four thousand, four hundred thirty-two".