19931784308 has 6 divisors (see below), whose sum is σ = 34880622546. Its totient is φ = 9965892152.

The previous prime is 19931784289. The next prime is 19931784319. The reversal of 19931784308 is 80348713991.

It can be written as a sum of positive squares in only one way, i.e., 16132048144 + 3799736164 = 127012^2 + 61642^2 .

It is a super-3 number, since 3×19931784308³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19931784308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2491473035 + ... + 2491473042.

It is an arithmetic number, because the mean of its divisors is an integer number (5813437091).

Almost surely, 2^19931784308 is an apocalyptic number.

It is an amenable number.

19931784308 is a deficient number, since it is larger than the sum of its proper divisors (14948838238).

19931784308 is a wasteful number, since it uses less digits than its factorization.

19931784308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982946081 (or 4982946079 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 19931784308 in words is "nineteen billion, nine hundred thirty-one million, seven hundred eighty-four thousand, three hundred eight".