19953740929 has 4 divisors (see below), whose sum is σ = 21003937840. Its totient is φ = 18903544020.

The previous prime is 19953740903. The next prime is 19953740959. The reversal of 19953740929 is 92904735991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19953740929 - 2¹¹ = 19953738881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19953740959) 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, 525098427 + ... + 525098464.

It is an arithmetic number, because the mean of its divisors is an integer number (5250984460).

Almost surely, 2^19953740929 is an apocalyptic number.

19953740929 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19953740929 is a deficient number, since it is larger than the sum of its proper divisors (1050196911).

19953740929 is a wasteful number, since it uses less digits than its factorization.

19953740929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050196910.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 19953740929 in words is "nineteen billion, nine hundred fifty-three million, seven hundred forty thousand, nine hundred twenty-nine".