20023720 has 32 divisors (see below), whose sum is σ = 47426400. Its totient is φ = 7587648.

The previous prime is 20023711. The next prime is 20023721. The reversal of 20023720 is 2732002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20023694 and 20023703.

It is not an unprimeable number, because it can be changed into a prime (20023721) 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, 12414 + ... + 13933.

It is an arithmetic number, because the mean of its divisors is an integer number (1482075).

Almost surely, 2^20023720 is an apocalyptic number.

20023720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20023720 is an abundant number, since it is smaller than the sum of its proper divisors (27402680).

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

20023720 is a wasteful number, since it uses less digits than its factorization.

20023720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26377 (or 26373 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 20023720 is about 4474.7871457758. The cubic root of 20023720 is about 271.5490292407.

Adding to 20023720 its reverse (2732002), we get a palindrome (22755722).

The spelling of 20023720 in words is "twenty million, twenty-three thousand, seven hundred twenty".