20673523 has 4 divisors (see below), whose sum is σ = 22263808. Its totient is φ = 19083240.

The previous prime is 20673517. The next prime is 20673533. The reversal of 20673523 is 32537602.

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 20673523 - 2¹⁷ = 20542451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20673491 and 20673500.

It is not an unprimeable number, because it can be changed into a prime (20673533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795123 + ... + 795148.

It is an arithmetic number, because the mean of its divisors is an integer number (5565952).

Almost surely, 2^20673523 is an apocalyptic number.

20673523 is a deficient number, since it is larger than the sum of its proper divisors (1590285).

20673523 is a wasteful number, since it uses less digits than its factorization.

20673523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590284.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 20673523 is about 4546.8145992552. The cubic root of 20673523 is about 274.4552212229.

The spelling of 20673523 in words is "twenty million, six hundred seventy-three thousand, five hundred twenty-three".