20731682 has 4 divisors (see below), whose sum is σ = 31097526. Its totient is φ = 10365840.

The previous prime is 20731681. The next prime is 20731699. The reversal of 20731682 is 28613702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 5058001 = 3959^2 + 2249^2 .

It is not an unprimeable number, because it can be changed into a prime (20731681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182919 + ... + 5182922.

Almost surely, 2^20731682 is an apocalyptic number.

20731682 is a deficient number, since it is larger than the sum of its proper divisors (10365844).

20731682 is a wasteful number, since it uses less digits than its factorization.

20731682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10365843.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20731682 is about 4553.2056839111. The cubic root of 20731682 is about 274.7123471509.

The spelling of 20731682 in words is "twenty million, seven hundred thirty-one thousand, six hundred eighty-two".