204202040420 has 72 divisors (see below), whose sum is σ = 501034476096. Its totient is φ = 69703628736.

The previous prime is 204202040407. The next prime is 204202040473. The reversal of 204202040420 is 24040202402.

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 = 204202040392 and 204202040401.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236504 + ... + 681423.

It is an arithmetic number, because the mean of its divisors is an integer number (6958812168).

Almost surely, 2^204202040420 is an apocalyptic number.

204202040420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204202040420 is an abundant number, since it is smaller than the sum of its proper divisors (296832435676).

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

204202040420 is a wasteful number, since it uses less digits than its factorization.

204202040420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918177 (or 918168 counting only the distinct ones).

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

Adding to 204202040420 its reverse (24040202402), we get a palindrome (228242242822).

The spelling of 204202040420 in words is "two hundred four billion, two hundred two million, forty thousand, four hundred twenty".