19917818030 has 32 divisors (see below), whose sum is σ = 39142113408. Its totient is φ = 7237146400.

The previous prime is 19917818023. The next prime is 19917818057. The reversal of 19917818030 is 3081871991.

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, 70565 + ... + 211695.

It is an arithmetic number, because the mean of its divisors is an integer number (1223191044).

Almost surely, 2^19917818030 is an apocalyptic number.

19917818030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 141130×141131.

19917818030 is a deficient number, since it is larger than the sum of its proper divisors (19224295378).

19917818030 is a wasteful number, since it uses less digits than its factorization.

19917818030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142432.

The product of its (nonzero) digits is 108864, while the sum is 47.

The spelling of 19917818030 in words is "nineteen billion, nine hundred seventeen million, eight hundred eighteen thousand, thirty".