20497923 has 6 divisors (see below), whose sum is σ = 29608124. Its totient is φ = 13665276.

The previous prime is 20497921. The next prime is 20497993. The reversal of 20497923 is 32979402.

It is not a de Polignac number, because 20497923 - 2¹ = 20497921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20497921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138765 + ... + 1138782.

Almost surely, 2^20497923 is an apocalyptic number.

20497923 is a deficient number, since it is larger than the sum of its proper divisors (9110201).

20497923 is a wasteful number, since it uses less digits than its factorization.

20497923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277553 (or 2277550 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20497923 is about 4527.4631969791. The cubic root of 20497923 is about 273.6759404338.

The spelling of 20497923 in words is "twenty million, four hundred ninety-seven thousand, nine hundred twenty-three".