20449797400 has 24 divisors (see below), whose sum is σ = 47545779420. Its totient is φ = 8179918880.

The previous prime is 20449797391. The next prime is 20449797449. The reversal of 20449797400 is 479794402.

It is a congruent number.

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, 51124294 + ... + 51124693.

Almost surely, 2^20449797400 is an apocalyptic number.

20449797400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20449797400 is an abundant number, since it is smaller than the sum of its proper divisors (27095982020).

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

20449797400 is a wasteful number, since it uses less digits than its factorization.

20449797400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102249003 (or 102248994 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 20449797400 in words is "twenty billion, four hundred forty-nine million, seven hundred ninety-seven thousand, four hundred".