20407873 has 8 divisors (see below), whose sum is σ = 20973960. Its totient is φ = 19845120.

The previous prime is 20407867. The next prime is 20407883. The reversal of 20407873 is 37870402.

It can be written as a sum of positive squares in 4 ways, for example, as 1459264 + 18948609 = 1208^2 + 4353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20407873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20407813) 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, 16161 + ... + 17377.

It is an arithmetic number, because the mean of its divisors is an integer number (2621745).

Almost surely, 2^20407873 is an apocalyptic number.

It is an amenable number.

20407873 is a deficient number, since it is larger than the sum of its proper divisors (566087).

20407873 is a wasteful number, since it uses less digits than its factorization.

20407873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20407873 is about 4517.5073879298. The cubic root of 20407873 is about 273.2745876461.

The spelling of 20407873 in words is "twenty million, four hundred seven thousand, eight hundred seventy-three".