16020551 has 4 divisors (see below), whose sum is σ = 16047552. Its totient is φ = 15993552.

The previous prime is 16020533. The next prime is 16020559. The reversal of 16020551 is 15502061.

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

It is a cyclic number.

It is not a de Polignac number, because 16020551 - 2¹⁴ = 16004167 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 (16020559) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12590 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (4011888).

Almost surely, 2^16020551 is an apocalyptic number.

16020551 is a deficient number, since it is larger than the sum of its proper divisors (27001).

16020551 is an equidigital number, since it uses as much as digits as its factorization.

16020551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27000.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 16020551 is about 4002.5680506395. The cubic root of 16020551 is about 252.0920498105.

The spelling of 16020551 in words is "sixteen million, twenty thousand, five hundred fifty-one".