20312020400 has 120 divisors (see below), whose sum is σ = 55839235584. Its totient is φ = 6955603200.

The previous prime is 20312020363. The next prime is 20312020403. The reversal of 20312020400 is 402021302.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (20312020403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2546819 + ... + 2554781.

Almost surely, 2^20312020400 is an apocalyptic number.

20312020400 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 20312020400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27919617792).

20312020400 is an abundant number, since it is smaller than the sum of its proper divisors (35527215184).

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

20312020400 is a wasteful number, since it uses less digits than its factorization.

20312020400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8899 (or 8888 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20312020400 its reverse (402021302), we get a palindrome (20714041702).

The spelling of 20312020400 in words is "twenty billion, three hundred twelve million, twenty thousand, four hundred".