19892722540 has 24 divisors (see below), whose sum is σ = 43591010400. Its totient is φ = 7611128448.

The previous prime is 19892722501. The next prime is 19892722541. The reversal of 19892722540 is 4522729891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19892722541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21622065 + ... + 21622984.

It is an arithmetic number, because the mean of its divisors is an integer number (1816292100).

Almost surely, 2^19892722540 is an apocalyptic number.

19892722540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19892722540 is an abundant number, since it is smaller than the sum of its proper divisors (23698287860).

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

19892722540 is a wasteful number, since it uses less digits than its factorization.

19892722540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43245081 (or 43245079 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 19892722540 in words is "nineteen billion, eight hundred ninety-two million, seven hundred twenty-two thousand, five hundred forty".