20926919 has 4 divisors (see below), whose sum is σ = 22536696. Its totient is φ = 19317144.

The previous prime is 20926907. The next prime is 20926921. The reversal of 20926919 is 91962902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91962902 = 2 ⋅45981451.

It is a cyclic number.

It is not a de Polignac number, because 20926919 - 2⁸ = 20926663 is a prime.

It is a super-2 number, since 2×20926919² = 875871877665122, 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804869 + ... + 804894.

It is an arithmetic number, because the mean of its divisors is an integer number (5634174).

Almost surely, 2^20926919 is an apocalyptic number.

20926919 is a deficient number, since it is larger than the sum of its proper divisors (1609777).

20926919 is a wasteful number, since it uses less digits than its factorization.

20926919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609776.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 20926919 is about 4574.5949547474. The cubic root of 20926919 is about 275.5720060840.

The spelling of 20926919 in words is "twenty million, nine hundred twenty-six thousand, nine hundred nineteen".