20400040446420 has 48 divisors (see below), whose sum is σ = 57121101692928. Its totient is φ = 5439916648320.

The previous prime is 20400040446413. The next prime is 20400040446427. The reversal of 20400040446420 is 2464404000402.

It is an interprime number because it is at equal distance from previous prime (20400040446413) and next prime (20400040446427).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400040446427) 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, 589410 + ... + 6414630.

It is an arithmetic number, because the mean of its divisors is an integer number (1190022951936).

Almost surely, 2^{20400040446420} is an apocalyptic number.

20400040446420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400040446420 is an abundant number, since it is smaller than the sum of its proper divisors (36721061246508).

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

20400040446420 is a wasteful number, since it uses less digits than its factorization.

20400040446420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883600 (or 5883598 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 20400040446420 its reverse (2464404000402), we get a palindrome (22864444446822).

The spelling of 20400040446420 in words is "twenty trillion, four hundred billion, forty million, four hundred forty-six thousand, four hundred twenty".