20782946 has 4 divisors (see below), whose sum is σ = 31174422. Its totient is φ = 10391472.

The previous prime is 20782939. The next prime is 20782969. The reversal of 20782946 is 64928702.

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., 12145225 + 8637721 = 3485^2 + 2939^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195735 + ... + 5195738.

Almost surely, 2^20782946 is an apocalyptic number.

20782946 is a deficient number, since it is larger than the sum of its proper divisors (10391476).

20782946 is a wasteful number, since it uses less digits than its factorization.

20782946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10391475.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20782946 is about 4558.8316485696. The cubic root of 20782946 is about 274.9385912468.

The spelling of 20782946 in words is "twenty million, seven hundred eighty-two thousand, nine hundred forty-six".