16620423 has 4 divisors (see below), whose sum is σ = 22160568. Its totient is φ = 11080280.

The previous prime is 16620391. The next prime is 16620431. The reversal of 16620423 is 32402661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16620423 - 2⁵ = 16620391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16620393 and 16620402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620463) 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, 2770068 + ... + 2770073.

It is an arithmetic number, because the mean of its divisors is an integer number (5540142).

Almost surely, 2^16620423 is an apocalyptic number.

16620423 is a deficient number, since it is larger than the sum of its proper divisors (5540145).

16620423 is an equidigital number, since it uses as much as digits as its factorization.

16620423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540144.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 16620423 is about 4076.8153011879. The cubic root of 16620423 is about 255.2000122427.

The spelling of 16620423 in words is "sixteen million, six hundred twenty thousand, four hundred twenty-three".