20435540 has 12 divisors (see below), whose sum is σ = 42914676. Its totient is φ = 8174208.

The previous prime is 20435539. The next prime is 20435563. The reversal of 20435540 is 4553402.

It can be written as a sum of positive squares in 2 ways, for example, as 2829124 + 17606416 = 1682^2 + 4196^2 .

It is a super-2 number, since 2×20435540² = 835222590183200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510869 + ... + 510908.

It is an arithmetic number, because the mean of its divisors is an integer number (3576223).

Almost surely, 2^20435540 is an apocalyptic number.

20435540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20435540 is an abundant number, since it is smaller than the sum of its proper divisors (22479136).

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

20435540 is a wasteful number, since it uses less digits than its factorization.

20435540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021786 (or 1021784 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20435540 is about 4520.5685483134. The cubic root of 20435540 is about 273.3980248756.

Adding to 20435540 its reverse (4553402), we get a palindrome (24988942).

The spelling of 20435540 in words is "twenty million, four hundred thirty-five thousand, five hundred forty".