20690250889 has 24 divisors (see below), whose sum is σ = 26060041280. Its totient is φ = 16079484960.

The previous prime is 20690250863. The next prime is 20690250943. The reversal of 20690250889 is 98805209602.

It is not a de Polignac number, because 20690250889 - 2⁷ = 20690250761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20690250839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288787 + ... + 353239.

Almost surely, 2^20690250889 is an apocalyptic number.

It is an amenable number.

20690250889 is a deficient number, since it is larger than the sum of its proper divisors (5369790391).

20690250889 is a wasteful number, since it uses less digits than its factorization.

20690250889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64861 (or 64850 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 20690250889 in words is "twenty billion, six hundred ninety million, two hundred fifty thousand, eight hundred eighty-nine".