18020377 has 4 divisors (see below), whose sum is σ = 18150160. Its totient is φ = 17890596.

The previous prime is 18020351. The next prime is 18020381. The reversal of 18020377 is 77302081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77302081 = 29 ⋅2665589.

It is a cyclic number.

It is not a de Polignac number, because 18020377 - 2¹⁵ = 17987609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18020347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64683 + ... + 64960.

It is an arithmetic number, because the mean of its divisors is an integer number (4537540).

Almost surely, 2^18020377 is an apocalyptic number.

It is an amenable number.

18020377 is a deficient number, since it is larger than the sum of its proper divisors (129783).

18020377 is a wasteful number, since it uses less digits than its factorization.

18020377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129782.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 18020377 is about 4245.0414603393. The cubic root of 18020377 is about 262.1729962883.

The spelling of 18020377 in words is "eighteen million, twenty thousand, three hundred seventy-seven".