20223945 has 32 divisors (see below), whose sum is σ = 41091840. Its totient is φ = 9244800.

The previous prime is 20223943. The next prime is 20223953. The reversal of 20223945 is 54932202.

It is not a de Polignac number, because 20223945 - 2¹ = 20223943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20223943) 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 31 ways as a sum of consecutive naturals, for example, 9756 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (1284120).

Almost surely, 2^20223945 is an apocalyptic number.

It is an amenable number.

20223945 is an abundant number, since it is smaller than the sum of its proper divisors (20867895).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20223945 is a wasteful number, since it uses less digits than its factorization.

20223945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21422 (or 21416 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20223945 is about 4497.1040681754. The cubic root of 20223945 is about 272.4511373264.

The spelling of 20223945 in words is "twenty million, two hundred twenty-three thousand, nine hundred forty-five".