20630112991 has 2 divisors, whose sum is σ = 20630112992. Its totient is φ = 20630112990.

The previous prime is 20630112983. The next prime is 20630113039. The reversal of 20630112991 is 19921103602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20630112991 - 2³ = 20630112983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20630112091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315056495 + 10315056496.

It is an arithmetic number, because the mean of its divisors is an integer number (10315056496).

Almost surely, 2^20630112991 is an apocalyptic number.

20630112991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20630112991 is an equidigital number, since it uses as much as digits as its factorization.

20630112991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 20630112991 in words is "twenty billion, six hundred thirty million, one hundred twelve thousand, nine hundred ninety-one".