19817953084 has 12 divisors (see below), whose sum is σ = 34718280408. Its totient is φ = 9898444400.

The previous prime is 19817953081. The next prime is 19817953087. The reversal of 19817953084 is 48035971891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19817953081) and next prime (19817953087).

It is a super-2 number, since 2×19817953084² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19817953081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2628802 + ... + 2636329.

It is an arithmetic number, because the mean of its divisors is an integer number (2893190034).

Almost surely, 2^19817953084 is an apocalyptic number.

It is an amenable number.

19817953084 is a deficient number, since it is larger than the sum of its proper divisors (14900327324).

19817953084 is a wasteful number, since it uses less digits than its factorization.

19817953084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266076 (or 5266074 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 19817953084 in words is "nineteen billion, eight hundred seventeen million, nine hundred fifty-three thousand, eighty-four".