20823101 has 4 divisors (see below), whose sum is σ = 22424892. Its totient is φ = 19221312.

The previous prime is 20823083. The next prime is 20823109. The reversal of 20823101 is 10132802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10132802 = 2 ⋅5066401.

It can be written as a sum of positive squares in 2 ways, for example, as 2247001 + 18576100 = 1499^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20823101 - 2¹⁰ = 20822077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20823101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800876 + ... + 800901.

It is an arithmetic number, because the mean of its divisors is an integer number (5606223).

Almost surely, 2^20823101 is an apocalyptic number.

It is an amenable number.

20823101 is a deficient number, since it is larger than the sum of its proper divisors (1601791).

20823101 is a wasteful number, since it uses less digits than its factorization.

20823101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601790.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20823101 is about 4563.2336122535. The cubic root of 20823101 is about 275.1155481370.

Adding to 20823101 its reverse (10132802), we get a palindrome (30955903).

The spelling of 20823101 in words is "twenty million, eight hundred twenty-three thousand, one hundred one".