20109686951 has 2 divisors, whose sum is σ = 20109686952. Its totient is φ = 20109686950.

The previous prime is 20109686867. The next prime is 20109686957. The reversal of 20109686951 is 15968690102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20109686951 - 2¹⁸ = 20109424807 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20109686896 and 20109686905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109686957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054843475 + 10054843476.

It is an arithmetic number, because the mean of its divisors is an integer number (10054843476).

Almost surely, 2^20109686951 is an apocalyptic number.

20109686951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109686951 is an equidigital number, since it uses as much as digits as its factorization.

20109686951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 20109686951 in words is "twenty billion, one hundred nine million, six hundred eighty-six thousand, nine hundred fifty-one".