20041623691 has 2 divisors, whose sum is σ = 20041623692. Its totient is φ = 20041623690.

The previous prime is 20041623631. The next prime is 20041623737. The reversal of 20041623691 is 19632614002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20041623691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20041623631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020811845 + 10020811846.

It is an arithmetic number, because the mean of its divisors is an integer number (10020811846).

Almost surely, 2^20041623691 is an apocalyptic number.

20041623691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041623691 is an equidigital number, since it uses as much as digits as its factorization.

20041623691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20041623691 in words is "twenty billion, forty-one million, six hundred twenty-three thousand, six hundred ninety-one".