20690250863 has 2 divisors, whose sum is σ = 20690250864. Its totient is φ = 20690250862.

The previous prime is 20690250859. The next prime is 20690250943. The reversal of 20690250863 is 36805209602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20690250863 - 2² = 20690250859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20690250863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20690250463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10345125431 + 10345125432.

It is an arithmetic number, because the mean of its divisors is an integer number (10345125432).

Almost surely, 2^20690250863 is an apocalyptic number.

20690250863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20690250863 is an equidigital number, since it uses as much as digits as its factorization.

20690250863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20690250863 in words is "twenty billion, six hundred ninety million, two hundred fifty thousand, eight hundred sixty-three".