20912243 has 8 divisors (see below), whose sum is σ = 22960560. Its totient is φ = 18888480.

The previous prime is 20912209. The next prime is 20912273. The reversal of 20912243 is 34221902.

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 20912243 - 2¹⁴ = 20895859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20912273) 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, 4328 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (2870070).

Almost surely, 2^20912243 is an apocalyptic number.

20912243 is a deficient number, since it is larger than the sum of its proper divisors (2048317).

20912243 is a wasteful number, since it uses less digits than its factorization.

20912243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12277.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20912243 is about 4572.9905969726. The cubic root of 20912243 is about 275.5075716818.

It can be divided in two parts, 2091 and 2243, that added together give a palindrome (4334).

The spelling of 20912243 in words is "twenty million, nine hundred twelve thousand, two hundred forty-three".