13820478 has 16 divisors (see below), whose sum is σ = 31589760. Its totient is φ = 3948696.

The previous prime is 13820461. The next prime is 13820483. The reversal of 13820478 is 87402831.

It is a super-2 number, since 2×13820478² = 382011224296968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164488 + ... + 164571.

It is an arithmetic number, because the mean of its divisors is an integer number (1974360).

Almost surely, 2^13820478 is an apocalyptic number.

13820478 is an abundant number, since it is smaller than the sum of its proper divisors (17769282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13820478 is a wasteful number, since it uses less digits than its factorization.

13820478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329071.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 13820478 is about 3717.5903485995. The cubic root of 13820478 is about 239.9796163244.

The spelling of 13820478 in words is "thirteen million, eight hundred twenty thousand, four hundred seventy-eight".