20157473 has 12 divisors (see below), whose sum is σ = 23695812. Its totient is φ = 17095680.

The previous prime is 20157451. The next prime is 20157493. The reversal of 20157473 is 37475102.

20157473 = 407² + 408² + ... + 503².

It can be written as a sum of positive squares in 2 ways, for example, as 15864289 + 4293184 = 3983^2 + 2072^2 .

It is not a de Polignac number, because 20157473 - 2¹² = 20153377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20157413) 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, 2633 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (1974651).

Almost surely, 2^20157473 is an apocalyptic number.

It is an amenable number.

20157473 is a deficient number, since it is larger than the sum of its proper divisors (3538339).

20157473 is an equidigital number, since it uses as much as digits as its factorization.

20157473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352 (or 4345 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20157473 is about 4489.7074514939. The cubic root of 20157473 is about 272.1523125090.

The spelling of 20157473 in words is "twenty million, one hundred fifty-seven thousand, four hundred seventy-three".