20493873 has 6 divisors (see below), whose sum is σ = 29602274. Its totient is φ = 13662576.

The previous prime is 20493839. The next prime is 20493877. The reversal of 20493873 is 37839402.

It can be written as a sum of positive squares in only one way, i.e., 20493729 + 144 = 4527^2 + 12^2 .

It is not a de Polignac number, because 20493873 - 2¹⁴ = 20477489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493877) 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, 1138540 + ... + 1138557.

Almost surely, 2^20493873 is an apocalyptic number.

It is an amenable number.

20493873 is a deficient number, since it is larger than the sum of its proper divisors (9108401).

20493873 is a wasteful number, since it uses less digits than its factorization.

20493873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277103 (or 2277100 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20493873 is about 4527.0159045446. The cubic root of 20493873 is about 273.6579148585.

The spelling of 20493873 in words is "twenty million, four hundred ninety-three thousand, eight hundred seventy-three".