20802746 has 4 divisors (see below), whose sum is σ = 31204122. Its totient is φ = 10401372.

The previous prime is 20802709. The next prime is 20802757. The reversal of 20802746 is 64720802.

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., 20802721 + 25 = 4561^2 + 5^2 .

It is a super-2 number, since 2×20802746² = 865508482281032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200685 + ... + 5200688.

Almost surely, 2^20802746 is an apocalyptic number.

20802746 is a deficient number, since it is larger than the sum of its proper divisors (10401376).

20802746 is a wasteful number, since it uses less digits than its factorization.

20802746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401375.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20802746 is about 4561.0027406262. The cubic root of 20802746 is about 275.0258752512.

The spelling of 20802746 in words is "twenty million, eight hundred two thousand, seven hundred forty-six".