20951223 has 16 divisors (see below), whose sum is σ = 28512000. Its totient is φ = 13682240.

The previous prime is 20951209. The next prime is 20951233. The reversal of 20951223 is 32215902.

It is a cyclic number.

It is not a de Polignac number, because 20951223 - 2⁶ = 20951159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20951193 and 20951202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34678 + ... + 35276.

It is an arithmetic number, because the mean of its divisors is an integer number (1782000).

Almost surely, 2^20951223 is an apocalyptic number.

20951223 is a deficient number, since it is larger than the sum of its proper divisors (7560777).

20951223 is a wasteful number, since it uses less digits than its factorization.

20951223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20951223 is about 4577.2505939701. The cubic root of 20951223 is about 275.6786456222.

The spelling of 20951223 in words is "twenty million, nine hundred fifty-one thousand, two hundred twenty-three".