20823087 has 16 divisors (see below), whose sum is σ = 28286720. Its totient is φ = 13623552.

The previous prime is 20823083. The next prime is 20823109. The reversal of 20823087 is 78032802.

It is not a de Polignac number, because 20823087 - 2² = 20823083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47214 + ... + 47652.

It is an arithmetic number, because the mean of its divisors is an integer number (1767920).

Almost surely, 2^20823087 is an apocalyptic number.

20823087 is a deficient number, since it is larger than the sum of its proper divisors (7463633).

20823087 is a wasteful number, since it uses less digits than its factorization.

20823087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20823087 is about 4563.2320782533. The cubic root of 20823087 is about 275.1154864808.

Adding to 20823087 its reverse (78032802), we get a palindrome (98855889).

The spelling of 20823087 in words is "twenty million, eight hundred twenty-three thousand, eighty-seven".