20497623 has 8 divisors (see below), whose sum is σ = 28518528. Its totient is φ = 13070904.

The previous prime is 20497621. The next prime is 20497639. The reversal of 20497623 is 32679402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20497623 - 2¹ = 20497621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148465 + ... + 148602.

It is an arithmetic number, because the mean of its divisors is an integer number (3564816).

Almost surely, 2^20497623 is an apocalyptic number.

20497623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20497623 is a deficient number, since it is larger than the sum of its proper divisors (8020905).

20497623 is a wasteful number, since it uses less digits than its factorization.

20497623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297093.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20497623 is about 4527.4300657216. The cubic root of 20497623 is about 273.6746052874.

The spelling of 20497623 in words is "twenty million, four hundred ninety-seven thousand, six hundred twenty-three".