19771593240 has 64 divisors (see below), whose sum is σ = 67788322560. Its totient is φ = 4519221120.

The previous prime is 19771593227. The next prime is 19771593251. The reversal of 19771593240 is 4239517791.

It is a self number, because there is not a number n which added to its sum of digits gives 19771593240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11767966 + ... + 11769645.

It is an arithmetic number, because the mean of its divisors is an integer number (1059192540).

Almost surely, 2^19771593240 is an apocalyptic number.

19771593240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19771593240 is an abundant number, since it is smaller than the sum of its proper divisors (48016729320).

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

19771593240 is a wasteful number, since it uses less digits than its factorization.

19771593240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23537632 (or 23537628 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 48.

The spelling of 19771593240 in words is "nineteen billion, seven hundred seventy-one million, five hundred ninety-three thousand, two hundred forty".