20235520 has 36 divisors (see below), whose sum is σ = 48473460. Its totient is φ = 8093696.

The previous prime is 20235511. The next prime is 20235547. The reversal of 20235520 is 2553202.

It can be written as a sum of positive squares in 2 ways, for example, as 3326976 + 16908544 = 1824^2 + 4112^2 .

It is a super-3 number, since 3×20235520³ (a number of 23 digits) contains 333 as substring.

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, 6625 + ... + 9184.

It is an arithmetic number, because the mean of its divisors is an integer number (1346485).

Almost surely, 2^20235520 is an apocalyptic number.

20235520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20235520 is an abundant number, since it is smaller than the sum of its proper divisors (28237940).

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

20235520 is an equidigital number, since it uses as much as digits as its factorization.

20235520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830 (or 15816 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20235520 is about 4498.3908233945. The cubic root of 20235520 is about 272.5031057638.

Adding to 20235520 its reverse (2553202), we get a palindrome (22788722).

The spelling of 20235520 in words is "twenty million, two hundred thirty-five thousand, five hundred twenty".