20846638 has 4 divisors (see below), whose sum is σ = 31269960. Its totient is φ = 10423318.

The previous prime is 20846627. The next prime is 20846653. The reversal of 20846638 is 83664802.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20846597 and 20846606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5211658 + ... + 5211661.

It is an arithmetic number, because the mean of its divisors is an integer number (7817490).

Almost surely, 2^20846638 is an apocalyptic number.

20846638 is a deficient number, since it is larger than the sum of its proper divisors (10423322).

20846638 is a wasteful number, since it uses less digits than its factorization.

20846638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10423321.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20846638 is about 4565.8118664702. The cubic root of 20846638 is about 275.2191663318.

The spelling of 20846638 in words is "twenty million, eight hundred forty-six thousand, six hundred thirty-eight".