20338646 has 4 divisors (see below), whose sum is σ = 30507972. Its totient is φ = 10169322.

The previous prime is 20338631. The next prime is 20338663. The reversal of 20338646 is 64683302.

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

It is a super-2 number, since 2×20338646² = 827321042226632, which contains 22 as substring.

It is a Curzon number.

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, 5084660 + ... + 5084663.

It is an arithmetic number, because the mean of its divisors is an integer number (7626993).

Almost surely, 2^20338646 is an apocalyptic number.

20338646 is a deficient number, since it is larger than the sum of its proper divisors (10169326).

20338646 is a wasteful number, since it uses less digits than its factorization.

20338646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10169325.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20338646 is about 4509.8387997799. The cubic root of 20338646 is about 272.9652395285.

The spelling of 20338646 in words is "twenty million, three hundred thirty-eight thousand, six hundred forty-six".