20423917 has 16 divisors (see below), whose sum is σ = 22521600. Its totient is φ = 18446400.

The previous prime is 20423911. The next prime is 20423927. The reversal of 20423917 is 71932402.

It is a cyclic number.

It is not a de Polignac number, because 20423917 - 2¹⁹ = 19899629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423911) 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, 55468 + ... + 55834.

It is an arithmetic number, because the mean of its divisors is an integer number (1407600).

Almost surely, 2^20423917 is an apocalyptic number.

It is an amenable number.

20423917 is a deficient number, since it is larger than the sum of its proper divisors (2097683).

20423917 is a wasteful number, since it uses less digits than its factorization.

20423917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20423917 is about 4519.2827970819. The cubic root of 20423917 is about 273.3461820584.

The spelling of 20423917 in words is "twenty million, four hundred twenty-three thousand, nine hundred seventeen".