20823379 has 4 divisors (see below), whose sum is σ = 20922280. Its totient is φ = 20724480.

The previous prime is 20823359. The next prime is 20823409. The reversal of 20823379 is 97332802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20823379 - 2⁵ = 20823347 is a prime.

It is a super-2 number, since 2×20823379² = 867226225955282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20823359) 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, 49134 + ... + 49555.

It is an arithmetic number, because the mean of its divisors is an integer number (5230570).

Almost surely, 2^20823379 is an apocalyptic number.

20823379 is a deficient number, since it is larger than the sum of its proper divisors (98901).

20823379 is an equidigital number, since it uses as much as digits as its factorization.

20823379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98900.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20823379 is about 4563.2640730074. The cubic root of 20823379 is about 275.1167724468.

The spelling of 20823379 in words is "twenty million, eight hundred twenty-three thousand, three hundred seventy-nine".