20199638953 has 8 divisors (see below), whose sum is σ = 21765060800. Its totient is φ = 18635874768.

The previous prime is 20199638911. The next prime is 20199638957. The reversal of 20199638953 is 35983699102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20199638953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20199638894 and 20199638903.

It is not an unprimeable number, because it can be changed into a prime (20199638957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389043 + ... + 437896.

It is an arithmetic number, because the mean of its divisors is an integer number (2720632600).

Almost surely, 2^20199638953 is an apocalyptic number.

It is an amenable number.

20199638953 is a deficient number, since it is larger than the sum of its proper divisors (1565421847).

20199638953 is a wasteful number, since it uses less digits than its factorization.

20199638953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828831.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 20199638953 in words is "twenty billion, one hundred ninety-nine million, six hundred thirty-eight thousand, nine hundred fifty-three".