20425335991 has 2 divisors, whose sum is σ = 20425335992. Its totient is φ = 20425335990.

The previous prime is 20425335989. The next prime is 20425336013. The reversal of 20425335991 is 19953352402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20425335991 - 2¹ = 20425335989 is a prime.

Together with 20425335989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20425335911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212667995 + 10212667996.

It is an arithmetic number, because the mean of its divisors is an integer number (10212667996).

Almost surely, 2^20425335991 is an apocalyptic number.

20425335991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425335991 is an equidigital number, since it uses as much as digits as its factorization.

20425335991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 20425335991 in words is "twenty billion, four hundred twenty-five million, three hundred thirty-five thousand, nine hundred ninety-one".