20823130 has 16 divisors (see below), whose sum is σ = 39686760. Its totient is φ = 7839232.

The previous prime is 20823109. The next prime is 20823139. The reversal of 20823130 is 3132802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20277009 + 546121 = 4503^2 + 739^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20823098 and 20823107.

It is not an unprimeable number, because it can be changed into a prime (20823139) 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, 61075 + ... + 61414.

Almost surely, 2^20823130 is an apocalyptic number.

20823130 is a deficient number, since it is larger than the sum of its proper divisors (18863630).

20823130 is a wasteful number, since it uses less digits than its factorization.

20823130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122513.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20823130 is about 4563.2367898236. The cubic root of 20823130 is about 275.1156758533.

Adding to 20823130 its reverse (3132802), we get a palindrome (23955932).

The spelling of 20823130 in words is "twenty million, eight hundred twenty-three thousand, one hundred thirty".