16220637 has 6 divisors (see below), whose sum is σ = 23429822. Its totient is φ = 10813752.

The previous prime is 16220629. The next prime is 16220639. The reversal of 16220637 is 73602261.

It is a happy number.

16220637 is a `hidden beast` number, since 1 + 6 + 2 + 20 + 637 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 1313316 = 3861^2 + 1146^2 .

It is not a de Polignac number, because 16220637 - 2³ = 16220629 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 16220637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16220639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 901138 + ... + 901155.

Almost surely, 2^16220637 is an apocalyptic number.

It is an amenable number.

16220637 is a deficient number, since it is larger than the sum of its proper divisors (7209185).

16220637 is a wasteful number, since it uses less digits than its factorization.

16220637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802299 (or 1802296 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 16220637 is about 4027.4851955035. The cubic root of 16220637 is about 253.1371979490.

Adding to 16220637 its reverse (73602261), we get a palindrome (89822898).

The spelling of 16220637 in words is "sixteen million, two hundred twenty thousand, six hundred thirty-seven".