19139193920 has 112 divisors (see below), whose sum is σ = 56821108608. Its totient is φ = 5965455360.

The previous prime is 19139193917. The next prime is 19139193923. The reversal of 19139193920 is 2939193191.

It is an interprime number because it is at equal distance from previous prime (19139193917) and next prime (19139193923).

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (19139193923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363737 + ... + 413016.

Almost surely, 2^19139193920 is an apocalyptic number.

19139193920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19139193920 is an abundant number, since it is smaller than the sum of its proper divisors (37681914688).

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

19139193920 is a wasteful number, since it uses less digits than its factorization.

19139193920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776788 (or 776778 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The spelling of 19139193920 in words is "nineteen billion, one hundred thirty-nine million, one hundred ninety-three thousand, nine hundred twenty".