16553820 has 24 divisors (see below), whose sum is σ = 46350864. Its totient is φ = 4414336.

The previous prime is 16553819. The next prime is 16553821. The reversal of 16553820 is 2835561.

It is an interprime number because it is at equal distance from previous prime (16553819) and next prime (16553821).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553821) 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, 137889 + ... + 138008.

It is an arithmetic number, because the mean of its divisors is an integer number (1931286).

Almost surely, 2^16553820 is an apocalyptic number.

16553820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16553820 is an abundant number, since it is smaller than the sum of its proper divisors (29797044).

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

16553820 is a wasteful number, since it uses less digits than its factorization.

16553820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275909 (or 275907 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 16553820 is about 4068.6385929448. The cubic root of 16553820 is about 254.8586683184.

The spelling of 16553820 in words is "sixteen million, five hundred fifty-three thousand, eight hundred twenty".