19946293938 has 24 divisors (see below), whose sum is σ = 43325844588. Its totient is φ = 6632014752.

The previous prime is 19946293937. The next prime is 19946293973. The reversal of 19946293938 is 83939264991.

It can be written as a sum of positive squares in 2 ways, for example, as 18953854929 + 992439009 = 137673^2 + 31503^2 .

It is a super-2 number, since 2×19946293938² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19946293937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1388481 + ... + 1402772.

Almost surely, 2^19946293938 is an apocalyptic number.

19946293938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19946293938 is an abundant number, since it is smaller than the sum of its proper divisors (23379550650).

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

19946293938 is a wasteful number, since it uses less digits than its factorization.

19946293938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791658 (or 2791655 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The spelling of 19946293938 in words is "nineteen billion, nine hundred forty-six million, two hundred ninety-three thousand, nine hundred thirty-eight".