20926989 has 12 divisors (see below), whose sum is σ = 30366336. Its totient is φ = 13887432.

The previous prime is 20926979. The next prime is 20926993. The reversal of 20926989 is 98962902.

It is not a de Polignac number, because 20926989 - 2⁴ = 20926973 is a prime.

It is a super-2 number, since 2×20926989² = 875877737212242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20926979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3207 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (2530528).

Almost surely, 2^20926989 is an apocalyptic number.

It is an amenable number.

20926989 is a deficient number, since it is larger than the sum of its proper divisors (9439347).

20926989 is a wasteful number, since it uses less digits than its factorization.

20926989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656 (or 10653 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20926989 is about 4574.6026056916. The cubic root of 20926989 is about 275.5723133440.

The spelling of 20926989 in words is "twenty million, nine hundred twenty-six thousand, nine hundred eighty-nine".