20520235262440 has 32 divisors (see below), whose sum is σ = 46453784136480. Its totient is φ = 8157737696832.

The previous prime is 20520235262431. The next prime is 20520235262453. The reversal of 20520235262440 is 4426253202502.

It is a self number, because there is not a number n which added to its sum of digits gives 20520235262440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1573631154 + ... + 1573644193.

It is an arithmetic number, because the mean of its divisors is an integer number (1451680754265).

Almost surely, 2^{20520235262440} is an apocalyptic number.

20520235262440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520235262440 is an abundant number, since it is smaller than the sum of its proper divisors (25933548874040).

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

20520235262440 is a wasteful number, since it uses less digits than its factorization.

20520235262440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147275521 (or 3147275517 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 20520235262440 its reverse (4426253202502), we get a palindrome (24946488464942).

The spelling of 20520235262440 in words is "twenty trillion, five hundred twenty billion, two hundred thirty-five million, two hundred sixty-two thousand, four hundred forty".