20200400204420 has 96 divisors (see below), whose sum is σ = 44003878490880. Its totient is φ = 7784388057600.

The previous prime is 20200400204407. The next prime is 20200400204443. The reversal of 20200400204420 is 2440200400202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20200400204392 and 20200400204401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22402046 + ... + 23286314.

It is an arithmetic number, because the mean of its divisors is an integer number (458373734280).

Almost surely, 2^{20200400204420} is an apocalyptic number.

20200400204420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20200400204420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22001939245440).

20200400204420 is an abundant number, since it is smaller than the sum of its proper divisors (23803478286460).

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

20200400204420 is a wasteful number, since it uses less digits than its factorization.

20200400204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884685 (or 884683 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20200400204420 its reverse (2440200400202), we get a palindrome (22640600604622).

The spelling of 20200400204420 in words is "twenty trillion, two hundred billion, four hundred million, two hundred four thousand, four hundred twenty".