16387820 has 12 divisors (see below), whose sum is σ = 34414464. Its totient is φ = 6555120.

The previous prime is 16387807. The next prime is 16387829. The reversal of 16387820 is 2878361.

It is not an unprimeable number, because it can be changed into a prime (16387829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409676 + ... + 409715.

It is an arithmetic number, because the mean of its divisors is an integer number (2867872).

Almost surely, 2^16387820 is an apocalyptic number.

16387820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16387820 is an abundant number, since it is smaller than the sum of its proper divisors (18026644).

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

16387820 is a wasteful number, since it uses less digits than its factorization.

16387820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819400 (or 819398 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 16387820 is about 4048.1872486336. The cubic root of 16387820 is about 254.0039059477.

The spelling of 16387820 in words is "sixteen million, three hundred eighty-seven thousand, eight hundred twenty".