20922817 has 8 divisors (see below), whose sum is σ = 21373632. Its totient is φ = 20475600.

The previous prime is 20922787. The next prime is 20922821. The reversal of 20922817 is 71822902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20922817 - 2¹⁹ = 20398529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20922017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13092 + ... + 14602.

It is an arithmetic number, because the mean of its divisors is an integer number (2671704).

Almost surely, 2^20922817 is an apocalyptic number.

It is an amenable number.

20922817 is a deficient number, since it is larger than the sum of its proper divisors (450815).

20922817 is a wasteful number, since it uses less digits than its factorization.

20922817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20922817 is about 4574.1465870695. The cubic root of 20922817 is about 275.5539994480.

The spelling of 20922817 in words is "twenty million, nine hundred twenty-two thousand, eight hundred seventeen".