19900744900 has 27 divisors (see below), whose sum is σ = 43187677869. Its totient is φ = 7959733680.

The previous prime is 19900744813. The next prime is 19900744957. The reversal of 19900744900 is 944700991.

The square root of 19900744900 is 141070.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7164268164 + 12736476736 = 84642^2 + 112856^2 .

It is a super-3 number, since 3×19900744900³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1403647 + ... + 1417753.

Almost surely, 2^19900744900 is an apocalyptic number.

19900744900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19900744900 is the 141070-th square number.

It is an amenable number.

19900744900 is an abundant number, since it is smaller than the sum of its proper divisors (23286932969).

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

19900744900 is an frugal number, since it uses more digits than its factorization.

19900744900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28228 (or 14114 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 19900744900 in words is "nineteen billion, nine hundred million, seven hundred forty-four thousand, nine hundred".