19953997376 has 14 divisors (see below), whose sum is σ = 39596213670. Its totient is φ = 9976998656.

The previous prime is 19953997373. The next prime is 19953997379. The reversal of 19953997376 is 67379935991.

It is an interprime number because it is at equal distance from previous prime (19953997373) and next prime (19953997379).

It can be written as a sum of positive squares in only one way, i.e., 18611507776 + 1342489600 = 136424^2 + 36640^2 .

It is a super-2 number, since 2×19953997376² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19953997373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155890541 + ... + 155890668.

Almost surely, 2^19953997376 is an apocalyptic number.

19953997376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19953997376 is a deficient number, since it is larger than the sum of its proper divisors (19642216294).

19953997376 is an equidigital number, since it uses as much as digits as its factorization.

19953997376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311781221 (or 311781211 counting only the distinct ones).

The product of its digits is 86802030, while the sum is 68.

The spelling of 19953997376 in words is "nineteen billion, nine hundred fifty-three million, nine hundred ninety-seven thousand, three hundred seventy-six".