400000202020 has 24 divisors (see below), whose sum is σ = 840042718200. Its totient is φ = 159992024832.

The previous prime is 400000202003. The next prime is 400000202029. The reversal of 400000202020 is 20202000004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 148830837796 + 251169364224 = 385786^2 + 501168^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 400000201988 and 400000202006.

It is not an unprimeable number, because it can be changed into a prime (400000202029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87985 + ... + 898744.

It is an arithmetic number, because the mean of its divisors is an integer number (35001779925).

Almost surely, 2^400000202020 is an apocalyptic number.

It is an amenable number.

400000202020 is an abundant number, since it is smaller than the sum of its proper divisors (440042516180).

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

400000202020 is a wasteful number, since it uses less digits than its factorization.

400000202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007007 (or 1007005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

Adding to 400000202020 its reverse (20202000004), we get a palindrome (420202202024).

It can be divided in two parts, 40000020 and 2020, that added together give a triangular number (40002040 = T₈₉₄₄).

The spelling of 400000202020 in words is "four hundred billion, two hundred two thousand, twenty".