18020351 has 2 divisors, whose sum is σ = 18020352. Its totient is φ = 18020350.

The previous prime is 18020347. The next prime is 18020381. The reversal of 18020351 is 15302081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18020351 - 2² = 18020347 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18020381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010175 + 9010176.

It is an arithmetic number, because the mean of its divisors is an integer number (9010176).

Almost surely, 2^18020351 is an apocalyptic number.

18020351 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020351 is an equidigital number, since it uses as much as digits as its factorization.

18020351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 18020351 is about 4245.0383979418. The cubic root of 18020351 is about 262.1728701995.

The spelling of 18020351 in words is "eighteen million, twenty thousand, three hundred fifty-one".