20697373 has 4 divisors (see below), whose sum is σ = 20706588. Its totient is φ = 20688160.

The previous prime is 20697371. The next prime is 20697379. The reversal of 20697373 is 37379602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18207289 + 2490084 = 4267^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 20697373 - 2¹ = 20697371 is a prime.

It is a super-2 number, since 2×20697373² = 856762498202258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (5176647).

Almost surely, 2^20697373 is an apocalyptic number.

It is an amenable number.

20697373 is a deficient number, since it is larger than the sum of its proper divisors (9215).

20697373 is an equidigital number, since it uses as much as digits as its factorization.

20697373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9214.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20697373 is about 4549.4365585202. The cubic root of 20697373 is about 274.5607223748.

It can be divided in two parts, 206973 and 73, that added together give a triangular number (207046 = T₆₄₃).

The spelling of 20697373 in words is "twenty million, six hundred ninety-seven thousand, three hundred seventy-three".