20926859 has 2 divisors, whose sum is σ = 20926860. Its totient is φ = 20926858.

The previous prime is 20926831. The next prime is 20926861. The reversal of 20926859 is 95862902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20926859 - 2¹² = 20922763 is a prime.

It is a super-3 number, since 3×20926859³ (a number of 23 digits) contains 333 as substring.

Together with 20926861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20926889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10463429 + 10463430.

It is an arithmetic number, because the mean of its divisors is an integer number (10463430).

Almost surely, 2^20926859 is an apocalyptic number.

20926859 is a deficient number, since it is larger than the sum of its proper divisors (1).

20926859 is an equidigital number, since it uses as much as digits as its factorization.

20926859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 20926859 is about 4574.5883967850. The cubic root of 20926859 is about 275.5717427177.

The spelling of 20926859 in words is "twenty million, nine hundred twenty-six thousand, eight hundred fifty-nine".