20910923 has 8 divisors (see below), whose sum is σ = 23125296. Its totient is φ = 18748800.

The previous prime is 20910919. The next prime is 20910941. The reversal of 20910923 is 32901902.

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

It is a cyclic number.

It is not a de Polignac number, because 20910923 - 2² = 20910919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20910892 and 20910901.

It is not an unprimeable number, because it can be changed into a prime (20910913) 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, 12218 + ... + 13823.

It is an arithmetic number, because the mean of its divisors is an integer number (2890662).

Almost surely, 2^20910923 is an apocalyptic number.

20910923 is a deficient number, since it is larger than the sum of its proper divisors (2214373).

20910923 is a wasteful number, since it uses less digits than its factorization.

20910923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26125.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20910923 is about 4572.8462690101. The cubic root of 20910923 is about 275.5017747961.

The spelling of 20910923 in words is "twenty million, nine hundred ten thousand, nine hundred twenty-three".