22506993 has 12 divisors (see below), whose sum is σ = 32554548. Its totient is φ = 14984160.

The previous prime is 22506983. The next prime is 22507013. The reversal of 22506993 is 39960522.

It can be written as a sum of positive squares in 2 ways, for example, as 9199089 + 13307904 = 3033^2 + 3648^2 .

It is not a de Polignac number, because 22506993 - 2⁴ = 22506977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22506973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8371 + ... + 10727.

It is an arithmetic number, because the mean of its divisors is an integer number (2712879).

Almost surely, 2^22506993 is an apocalyptic number.

It is an amenable number.

22506993 is a deficient number, since it is larger than the sum of its proper divisors (10047555).

22506993 is a wasteful number, since it uses less digits than its factorization.

22506993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424 (or 3421 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 22506993 is about 4744.1535599093. The cubic root of 22506993 is about 282.3400530346.

The spelling of 22506993 in words is "twenty-two million, five hundred six thousand, nine hundred ninety-three".