20623320 has 48 divisors (see below), whose sum is σ = 67026960. Its totient is φ = 5499456.

The previous prime is 20623313. The next prime is 20623327. The reversal of 20623320 is 2332602.

20623320 is a `hidden beast` number, since 20 + 623 + 3 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (20623313) and next prime (20623327).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20623293 and 20623302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28284 + ... + 29003.

It is an arithmetic number, because the mean of its divisors is an integer number (1396395).

Almost surely, 2^20623320 is an apocalyptic number.

20623320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20623320 is an abundant number, since it is smaller than the sum of its proper divisors (46403640).

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

20623320 is a wasteful number, since it uses less digits than its factorization.

20623320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57304 (or 57297 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20623320 is about 4541.2905654670. The cubic root of 20623320 is about 274.2328813790.

Adding to 20623320 its reverse (2332602), we get a palindrome (22955922).

The spelling of 20623320 in words is "twenty million, six hundred twenty-three thousand, three hundred twenty".