20401122220 has 12 divisors (see below), whose sum is σ = 42842356704. Its totient is φ = 8160448880.

The previous prime is 20401122211. The next prime is 20401122251. The reversal of 20401122220 is 2222110402.

It is a junction number, because it is equal to n+sod(n) for n = 20401122194 and 20401122203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510028036 + ... + 510028075.

It is an arithmetic number, because the mean of its divisors is an integer number (3570196392).

Almost surely, 2^20401122220 is an apocalyptic number.

20401122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401122220 is an abundant number, since it is smaller than the sum of its proper divisors (22441234484).

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

20401122220 is a wasteful number, since it uses less digits than its factorization.

20401122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020056120 (or 1020056118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20401122220 its reverse (2222110402), we get a palindrome (22623232622).

The spelling of 20401122220 in words is "twenty billion, four hundred one million, one hundred twenty-two thousand, two hundred twenty".