20120205424440 has 64 divisors (see below), whose sum is σ = 65847945029760. Its totient is φ = 4877625557120.

The previous prime is 20120205424391. The next prime is 20120205424447. The reversal of 20120205424440 is 4442450202102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20120205424398 and 20120205424407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120205424447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7621288614 + ... + 7621291253.

It is an arithmetic number, because the mean of its divisors is an integer number (1028874141090).

Almost surely, 2^{20120205424440} is an apocalyptic number.

20120205424440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120205424440 is an abundant number, since it is smaller than the sum of its proper divisors (45727739605320).

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

20120205424440 is a wasteful number, since it uses less digits than its factorization.

20120205424440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15242579892 (or 15242579888 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 20120205424440 its reverse (4442450202102), we get a palindrome (24562655626542).

The spelling of 20120205424440 in words is "twenty trillion, one hundred twenty billion, two hundred five million, four hundred twenty-four thousand, four hundred forty".