20499990623 has 16 divisors (see below), whose sum is σ = 23651819520. Its totient is φ = 17404432416.

The previous prime is 20499990593. The next prime is 20499990653. The reversal of 20499990623 is 32609999402.

It is an interprime number because it is at equal distance from previous prime (20499990593) and next prime (20499990653).

It is not a de Polignac number, because 20499990623 - 2¹⁶ = 20499925087 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499990653) 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 15 ways as a sum of consecutive naturals, for example, 531665 + ... + 568917.

It is an arithmetic number, because the mean of its divisors is an integer number (1478238720).

Almost surely, 2^20499990623 is an apocalyptic number.

20499990623 is a deficient number, since it is larger than the sum of its proper divisors (3151828897).

20499990623 is a wasteful number, since it uses less digits than its factorization.

20499990623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38006.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The spelling of 20499990623 in words is "twenty billion, four hundred ninety-nine million, nine hundred ninety thousand, six hundred twenty-three".