16420631 has 4 divisors (see below), whose sum is σ = 16452552. Its totient is φ = 16388712.

The previous prime is 16420601. The next prime is 16420661. The reversal of 16420631 is 13602461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13602461 = 19 ⋅715919.

It is an interprime number because it is at equal distance from previous prime (16420601) and next prime (16420661).

It is a cyclic number.

It is not a de Polignac number, because 16420631 - 2¹⁴ = 16404247 is a prime.

It is a super-2 number, since 2×16420631² = 539274244876322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16420597 and 16420606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15176 + ... + 16221.

It is an arithmetic number, because the mean of its divisors is an integer number (4113138).

Almost surely, 2^16420631 is an apocalyptic number.

16420631 is a deficient number, since it is larger than the sum of its proper divisors (31921).

16420631 is an equidigital number, since it uses as much as digits as its factorization.

16420631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31920.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 16420631 is about 4052.2377768339. The cubic root of 16420631 is about 254.1733115645.

The spelling of 16420631 in words is "sixteen million, four hundred twenty thousand, six hundred thirty-one".