20420242440420 has 48 divisors (see below), whose sum is σ = 57206756311488. Its totient is φ = 5442533462400.

The previous prime is 20420242440419. The next prime is 20420242440463. The reversal of 20420242440420 is 2404424202402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89401294 + ... + 89629413.

It is an arithmetic number, because the mean of its divisors is an integer number (1191807423156).

Almost surely, 2^{20420242440420} is an apocalyptic number.

20420242440420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420242440420 is an abundant number, since it is smaller than the sum of its proper divisors (36786513871068).

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

20420242440420 is a wasteful number, since it uses less digits than its factorization.

20420242440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179032620 (or 179032618 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 30.

Adding to 20420242440420 its reverse (2404424202402), we get a palindrome (22824666642822).

The spelling of 20420242440420 in words is "twenty trillion, four hundred twenty billion, two hundred forty-two million, four hundred forty thousand, four hundred twenty".