20946638 has 16 divisors (see below), whose sum is σ = 32693760. Its totient is φ = 10054200.

The previous prime is 20946619. The next prime is 20946649. The reversal of 20946638 is 83664902.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6833 + ... + 9411.

It is an arithmetic number, because the mean of its divisors is an integer number (2043360).

Almost surely, 2^20946638 is an apocalyptic number.

20946638 is a deficient number, since it is larger than the sum of its proper divisors (11747122).

20946638 is a wasteful number, since it uses less digits than its factorization.

20946638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2743.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 20946638 is about 4576.7497200524. The cubic root of 20946638 is about 275.6585341661.

The spelling of 20946638 in words is "twenty million, nine hundred forty-six thousand, six hundred thirty-eight".