23220020 has 12 divisors (see below), whose sum is σ = 48762084. Its totient is φ = 9288000.

The previous prime is 23220019. The next prime is 23220037. The reversal of 23220020 is 2002232.

It can be written as a sum of positive squares in 2 ways, for example, as 3541924 + 19678096 = 1882^2 + 4436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23219983 and 23220010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580481 + ... + 580520.

It is an arithmetic number, because the mean of its divisors is an integer number (4063507).

Almost surely, 2^23220020 is an apocalyptic number.

23220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23220020 is an abundant number, since it is smaller than the sum of its proper divisors (25542064).

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

23220020 is a wasteful number, since it uses less digits than its factorization.

23220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161010 (or 1161008 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 23220020 is about 4818.7155965049. The cubic root of 23220020 is about 285.2906443012.

Adding to 23220020 its reverse (2002232), we get a palindrome (25222252).

The spelling of 23220020 in words is "twenty-three million, two hundred twenty thousand, twenty".