20400031300 has 54 divisors (see below), whose sum is σ = 48658318394. Its totient is φ = 7418188800.

The previous prime is 20400031277. The next prime is 20400031307. The reversal of 20400031300 is 313000402.

It can be written as a sum of positive squares in 3 ways, for example, as 4872877636 + 15527153664 = 69806^2 + 124608^2 .

It is a super-2 number, since 2×20400031300² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20400031307) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 830877 + ... + 855076.

Almost surely, 2^20400031300 is an apocalyptic number.

20400031300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400031300 is an abundant number, since it is smaller than the sum of its proper divisors (28258287094).

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

20400031300 is a wasteful number, since it uses less digits than its factorization.

20400031300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685989 (or 1685971 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20400031300 its reverse (313000402), we get a palindrome (20713031702).

The spelling of 20400031300 in words is "twenty billion, four hundred million, thirty-one thousand, three hundred".