20920223 has 4 divisors (see below), whose sum is σ = 21641640. Its totient is φ = 20198808.

The previous prime is 20920201. The next prime is 20920241. The reversal of 20920223 is 32202902.

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 20920223 - 2⁸ = 20919967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20920195 and 20920204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920243) 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, 360665 + ... + 360722.

It is an arithmetic number, because the mean of its divisors is an integer number (5410410).

Almost surely, 2^20920223 is an apocalyptic number.

20920223 is a deficient number, since it is larger than the sum of its proper divisors (721417).

20920223 is an equidigital number, since it uses as much as digits as its factorization.

20920223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721416.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20920223 is about 4573.8630281197. The cubic root of 20920223 is about 275.5426112967.

The spelling of 20920223 in words is "twenty million, nine hundred twenty thousand, two hundred twenty-three".