20400220202 has 8 divisors (see below), whose sum is σ = 30620885700. Its totient is φ = 10193258304.

The previous prime is 20400220193. The next prime is 20400220213. The reversal of 20400220202 is 20202200402.

It can be written as a sum of positive squares in 2 ways, for example, as 19717495561 + 682724641 = 140419^2 + 26129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422177 + ... + 3428132.

Almost surely, 2^20400220202 is an apocalyptic number.

20400220202 is a deficient number, since it is larger than the sum of its proper divisors (10220665498).

20400220202 is a wasteful number, since it uses less digits than its factorization.

20400220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851800.

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20400220202 its reverse (20202200402), we get a palindrome (40602420604).

The spelling of 20400220202 in words is "twenty billion, four hundred million, two hundred twenty thousand, two hundred two".