20763220 has 24 divisors (see below), whose sum is σ = 44668008. Its totient is φ = 8102400.

The previous prime is 20763203. The next prime is 20763229. The reversal of 20763220 is 2236702.

It can be written as a sum of positive squares in 4 ways, for example, as 853776 + 19909444 = 924^2 + 4462^2 .

It is a super-2 number, since 2×20763220² = 862222609536800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20763191 and 20763200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20763229) 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, 11841 + ... + 13480.

It is an arithmetic number, because the mean of its divisors is an integer number (1861167).

Almost surely, 2^20763220 is an apocalyptic number.

20763220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20763220 is an abundant number, since it is smaller than the sum of its proper divisors (23904788).

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

20763220 is a wasteful number, since it uses less digits than its factorization.

20763220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25371 (or 25369 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20763220 is about 4556.6676420384. The cubic root of 20763220 is about 274.8515783112.

Adding to 20763220 its reverse (2236702), we get a palindrome (22999922).

The spelling of 20763220 in words is "twenty million, seven hundred sixty-three thousand, two hundred twenty".