20523320 has 16 divisors (see below), whose sum is σ = 46177560. Its totient is φ = 8209312.

The previous prime is 20523317. The next prime is 20523323. The reversal of 20523320 is 2332502.

It is an interprime number because it is at equal distance from previous prime (20523317) and next prime (20523323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256502 + ... + 256581.

Almost surely, 2^20523320 is an apocalyptic number.

20523320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20523320 is an abundant number, since it is smaller than the sum of its proper divisors (25654240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20523320 is a wasteful number, since it uses less digits than its factorization.

20523320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513094 (or 513090 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 17.

The square root of 20523320 is about 4530.2671002933. The cubic root of 20523320 is about 273.7889222751.

Adding to 20523320 its reverse (2332502), we get a palindrome (22855822).

The spelling of 20523320 in words is "twenty million, five hundred twenty-three thousand, three hundred twenty".