20451682 has 4 divisors (see below), whose sum is σ = 30677526. Its totient is φ = 10225840.

The previous prime is 20451679. The next prime is 20451709. The reversal of 20451682 is 28615402.

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., 20241001 + 210681 = 4499^2 + 459^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20451682.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112919 + ... + 5112922.

Almost surely, 2^20451682 is an apocalyptic number.

20451682 is a deficient number, since it is larger than the sum of its proper divisors (10225844).

20451682 is a wasteful number, since it uses less digits than its factorization.

20451682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10225843.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20451682 is about 4522.3535907755. The cubic root of 20451682 is about 273.4699914827.

The spelling of 20451682 in words is "twenty million, four hundred fifty-one thousand, six hundred eighty-two".