20731623 has 8 divisors (see below), whose sum is σ = 30155136. Its totient is φ = 12564600.

The previous prime is 20731589. The next prime is 20731637. The reversal of 20731623 is 32613702.

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

It is not a de Polignac number, because 20731623 - 2¹³ = 20723431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20731593 and 20731602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314083 + ... + 314148.

It is an arithmetic number, because the mean of its divisors is an integer number (3769392).

Almost surely, 2^20731623 is an apocalyptic number.

20731623 is a deficient number, since it is larger than the sum of its proper divisors (9423513).

20731623 is a wasteful number, since it uses less digits than its factorization.

20731623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628245.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20731623 is about 4553.1992049547. The cubic root of 20731623 is about 274.7120865507.

The spelling of 20731623 in words is "twenty million, seven hundred thirty-one thousand, six hundred twenty-three".