20523307 has 6 divisors (see below), whose sum is σ = 23874108. Its totient is φ = 17591364.

The previous prime is 20523299. The next prime is 20523317. The reversal of 20523307 is 70332502.

It is a happy number.

It is not a de Polignac number, because 20523307 - 2³ = 20523299 is a prime.

It is a super-2 number, since 2×20523307² = 842412260432498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20523317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209373 + ... + 209470.

It is an arithmetic number, because the mean of its divisors is an integer number (3979018).

Almost surely, 2^20523307 is an apocalyptic number.

20523307 is a deficient number, since it is larger than the sum of its proper divisors (3350801).

20523307 is an equidigital number, since it uses as much as digits as its factorization.

20523307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418857 (or 418850 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20523307 is about 4530.2656654991. The cubic root of 20523307 is about 273.7888644668.

Adding to 20523307 its reverse (70332502), we get a palindrome (90855809).

The spelling of 20523307 in words is "twenty million, five hundred twenty-three thousand, three hundred seven".