20917023 has 8 divisors (see below), whose sum is σ = 28093488. Its totient is φ = 13842624.

The previous prime is 20917007. The next prime is 20917031. The reversal of 20917023 is 32071902.

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

It is not a de Polignac number, because 20917023 - 2⁴ = 20917007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20916984 and 20917002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20917073) 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, 25036 + ... + 25857.

It is an arithmetic number, because the mean of its divisors is an integer number (3511686).

Almost surely, 2^20917023 is an apocalyptic number.

20917023 is a deficient number, since it is larger than the sum of its proper divisors (7176465).

20917023 is a wasteful number, since it uses less digits than its factorization.

20917023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51033.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20917023 is about 4573.5132010305. The cubic root of 20917023 is about 275.5285613937.

Adding to 20917023 its reverse (32071902), we get a palindrome (52988925).

The spelling of 20917023 in words is "twenty million, nine hundred seventeen thousand, twenty-three".