19920519918 has 64 divisors (see below), whose sum is σ = 48136058880. Its totient is φ = 6069860064.

The previous prime is 19920519893. The next prime is 19920519943. The reversal of 19920519918 is 81991502991.

19920519918 is a `hidden beast` number, since 1 + 99 + 20 + 519 + 9 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (19920519893) and next prime (19920519943).

It is a super-2 number, since 2×19920519918² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65446 + ... + 210057.

It is an arithmetic number, because the mean of its divisors is an integer number (752125920).

Almost surely, 2^19920519918 is an apocalyptic number.

19920519918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19920519918 is an abundant number, since it is smaller than the sum of its proper divisors (28215538962).

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

19920519918 is a wasteful number, since it uses less digits than its factorization.

19920519918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275630 (or 275624 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 54.

The spelling of 19920519918 in words is "nineteen billion, nine hundred twenty million, five hundred nineteen thousand, nine hundred eighteen".