20403115400 has 24 divisors (see below), whose sum is σ = 47437243770. Its totient is φ = 8161246080.

The previous prime is 20403115391. The next prime is 20403115429. The reversal of 20403115400 is 451130402.

It can be written as a sum of positive squares in 3 ways, for example, as 15930983524 + 4472131876 = 126218^2 + 66874^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51007589 + ... + 51007988.

Almost surely, 2^20403115400 is an apocalyptic number.

20403115400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403115400 is an abundant number, since it is smaller than the sum of its proper divisors (27034128370).

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

20403115400 is a wasteful number, since it uses less digits than its factorization.

20403115400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102015593 (or 102015584 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20403115400 its reverse (451130402), we get a palindrome (20854245802).

The spelling of 20403115400 in words is "twenty billion, four hundred three million, one hundred fifteen thousand, four hundred".