20926889 has 2 divisors, whose sum is σ = 20926890. Its totient is φ = 20926888.

The previous prime is 20926883. The next prime is 20926907. The reversal of 20926889 is 98862902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 3579664 = 4165^2 + 1892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20926889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20926883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10463444 + 10463445.

It is an arithmetic number, because the mean of its divisors is an integer number (10463445).

Almost surely, 2^20926889 is an apocalyptic number.

It is an amenable number.

20926889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20926889 is an equidigital number, since it uses as much as digits as its factorization.

20926889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 20926889 is about 4574.5916757674. The cubic root of 20926889 is about 275.5718744009.

The spelling of 20926889 in words is "twenty million, nine hundred twenty-six thousand, eight hundred eighty-nine".