20311253400 has 96 divisors (see below), whose sum is σ = 63281664000. Its totient is φ = 5389084800.

The previous prime is 20311253399. The next prime is 20311253401. The reversal of 20311253400 is 435211302.

It is an interprime number because it is at equal distance from previous prime (20311253399) and next prime (20311253401).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311253401) 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, 34345 + ... + 204455.

It is an arithmetic number, because the mean of its divisors is an integer number (659184000).

Almost surely, 2^20311253400 is an apocalyptic number.

20311253400 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 20311253400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31640832000).

20311253400 is an abundant number, since it is smaller than the sum of its proper divisors (42970410600).

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

20311253400 is a wasteful number, since it uses less digits than its factorization.

20311253400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170329 (or 170320 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20311253400 its reverse (435211302), we get a palindrome (20746464702).

The spelling of 20311253400 in words is "twenty billion, three hundred eleven million, two hundred fifty-three thousand, four hundred".