20195856403 has 2 divisors, whose sum is σ = 20195856404. Its totient is φ = 20195856402.

The previous prime is 20195856341. The next prime is 20195856407. The reversal of 20195856403 is 30465859102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20195856403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20195856403.

It is not a weakly prime, because it can be changed into another prime (20195856407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097928201 + 10097928202.

It is an arithmetic number, because the mean of its divisors is an integer number (10097928202).

Almost surely, 2^20195856403 is an apocalyptic number.

20195856403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195856403 is an equidigital number, since it uses as much as digits as its factorization.

20195856403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 20195856403 in words is "twenty billion, one hundred ninety-five million, eight hundred fifty-six thousand, four hundred three".