20304402400 has 36 divisors (see below), whose sum is σ = 49568124312. Its totient is φ = 8121760640.

The previous prime is 20304402397. The next prime is 20304402409. The reversal of 20304402400 is 420440302.

It is a super-2 number, since 2×20304402400² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304402409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12689452 + ... + 12691051.

It is an arithmetic number, because the mean of its divisors is an integer number (1376892342).

Almost surely, 2^20304402400 is an apocalyptic number.

20304402400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20304402400 is an abundant number, since it is smaller than the sum of its proper divisors (29263721912).

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

20304402400 is a wasteful number, since it uses less digits than its factorization.

20304402400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25380523 (or 25380510 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20304402400 its reverse (420440302), we get a palindrome (20724842702).

The spelling of 20304402400 in words is "twenty billion, three hundred four million, four hundred two thousand, four hundred".