13820647 has 8 divisors (see below), whose sum is σ = 14396832. Its totient is φ = 13255200.

The previous prime is 13820633. The next prime is 13820671. The reversal of 13820647 is 74602831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13820647 - 2²³ = 5432039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13820687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4 + ... + 5257.

It is an arithmetic number, because the mean of its divisors is an integer number (1799604).

Almost surely, 2^13820647 is an apocalyptic number.

13820647 is a deficient number, since it is larger than the sum of its proper divisors (576185).

13820647 is an equidigital number, since it uses as much as digits as its factorization.

13820647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 13820647 is about 3717.6130783071. The cubic root of 13820647 is about 239.9805944958.

The spelling of 13820647 in words is "thirteen million, eight hundred twenty thousand, six hundred forty-seven".