20404413400 has 144 divisors (see below), whose sum is σ = 55262925000. Its totient is φ = 6986004480.

The previous prime is 20404413397. The next prime is 20404413437. The reversal of 20404413400 is 431440402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12239367 + ... + 12241033.

Almost surely, 2^20404413400 is an apocalyptic number.

20404413400 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 20404413400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27631462500).

20404413400 is an abundant number, since it is smaller than the sum of its proper divisors (34858511600).

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

20404413400 is a wasteful number, since it uses less digits than its factorization.

20404413400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946 (or 2930 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20404413400 its reverse (431440402), we get a palindrome (20835853802).

The spelling of 20404413400 in words is "twenty billion, four hundred four million, four hundred thirteen thousand, four hundred".