20400244424420 has 48 divisors (see below), whose sum is σ = 50099204926848. Its totient is φ = 6831709758720.

The previous prime is 20400244424407. The next prime is 20400244424467. The reversal of 20400244424420 is 2442444200402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1694366441 + ... + 1694378480.

It is an arithmetic number, because the mean of its divisors is an integer number (1043733435976).

Almost surely, 2^{20400244424420} is an apocalyptic number.

20400244424420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400244424420 is an abundant number, since it is smaller than the sum of its proper divisors (29698960502428).

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

20400244424420 is a wasteful number, since it uses less digits than its factorization.

20400244424420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388744980 (or 3388744978 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 32.

Adding to 20400244424420 its reverse (2442444200402), we get a palindrome (22842688624822).

The spelling of 20400244424420 in words is "twenty trillion, four hundred billion, two hundred forty-four million, four hundred twenty-four thousand, four hundred twenty".