18220629 has 16 divisors (see below), whose sum is σ = 27940352. Its totient is φ = 10345968.

The previous prime is 18220621. The next prime is 18220633. The reversal of 18220629 is 92602281.

It is not a de Polignac number, because 18220629 - 2³ = 18220621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18220596 and 18220605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762 + ... + 6084.

It is an arithmetic number, because the mean of its divisors is an integer number (1746272).

Almost surely, 2^18220629 is an apocalyptic number.

18220629 is the 2282-nd nonagonal number.

It is an amenable number.

18220629 is a deficient number, since it is larger than the sum of its proper divisors (9719723).

18220629 is a wasteful number, since it uses less digits than its factorization.

18220629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5496.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18220629 is about 4268.5628729117. The cubic root of 18220629 is about 263.1405562689.

The spelling of 18220629 in words is "eighteen million, two hundred twenty thousand, six hundred twenty-nine".