20199638951 has 4 divisors (see below), whose sum is σ = 20200075872. Its totient is φ = 20199202032.

The previous prime is 20199638911. The next prime is 20199638957. The reversal of 20199638951 is 15983699102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20199638951 - 2¹⁴ = 20199622567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20199638893 and 20199638902.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 139631 + ... + 244736.

It is an arithmetic number, because the mean of its divisors is an integer number (5050018968).

Almost surely, 2^20199638951 is an apocalyptic number.

20199638951 is a deficient number, since it is larger than the sum of its proper divisors (436921).

20199638951 is an equidigital number, since it uses as much as digits as its factorization.

20199638951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436920.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The spelling of 20199638951 in words is "twenty billion, one hundred ninety-nine million, six hundred thirty-eight thousand, nine hundred fifty-one".