20682946 has 4 divisors (see below), whose sum is σ = 31024422. Its totient is φ = 10341472.

The previous prime is 20682943. The next prime is 20682953. The reversal of 20682946 is 64928602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64928602 = 2 ⋅32464301.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 25921 = 4545^2 + 161^2 .

It is not an unprimeable number, because it can be changed into a prime (20682943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5170735 + ... + 5170738.

Almost surely, 2^20682946 is an apocalyptic number.

20682946 is a deficient number, since it is larger than the sum of its proper divisors (10341476).

20682946 is a wasteful number, since it uses less digits than its factorization.

20682946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10341475.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20682946 is about 4547.8507011554. The cubic root of 20682946 is about 274.4969138220.

The spelling of 20682946 in words is "twenty million, six hundred eighty-two thousand, nine hundred forty-six".