20623493 has 16 divisors (see below), whose sum is σ = 23941440. Its totient is φ = 17568000.

The previous prime is 20623489. The next prime is 20623507. The reversal of 20623493 is 39432602.

It is a cyclic number.

It is not a de Polignac number, because 20623493 - 2² = 20623489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20621 + ... + 21597.

It is an arithmetic number, because the mean of its divisors is an integer number (1496340).

Almost surely, 2^20623493 is an apocalyptic number.

It is an amenable number.

20623493 is a deficient number, since it is larger than the sum of its proper divisors (3317947).

20623493 is a wasteful number, since it uses less digits than its factorization.

20623493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 20623493 is about 4541.3096128760. The cubic root of 20623493 is about 274.2336481834.

It can be divided in two parts, 2062 and 3493, that added together give a palindrome (5555).

The spelling of 20623493 in words is "twenty million, six hundred twenty-three thousand, four hundred ninety-three".