20402404402220 has 24 divisors (see below), whose sum is σ = 42845597600064. Its totient is φ = 8160857312256.

The previous prime is 20402404402153. The next prime is 20402404402223. The reversal of 20402404402220 is 2220440420402.

It is a self number, because there is not a number n which added to its sum of digits gives 20402404402220.

It is not an unprimeable number, because it can be changed into a prime (20402404402223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4916597 + ... + 8060876.

It is an arithmetic number, because the mean of its divisors is an integer number (1785233233336).

Almost surely, 2^{20402404402220} is an apocalyptic number.

20402404402220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402404402220 is an abundant number, since it is smaller than the sum of its proper divisors (22443193197844).

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

20402404402220 is a wasteful number, since it uses less digits than its factorization.

20402404402220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13056089 (or 13056087 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20402404402220 its reverse (2220440420402), we get a palindrome (22622844822622).

The spelling of 20402404402220 in words is "twenty trillion, four hundred two billion, four hundred four million, four hundred two thousand, two hundred twenty".