20420401122 has 96 divisors (see below), whose sum is σ = 51254985600. Its totient is φ = 5806978560.

The previous prime is 20420401109. The next prime is 20420401129. The reversal of 20420401122 is 22110402402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20420401095 and 20420401104.

It is not an unprimeable number, because it can be changed into a prime (20420401129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1166043 + ... + 1183425.

It is an arithmetic number, because the mean of its divisors is an integer number (533906100).

Almost surely, 2^20420401122 is an apocalyptic number.

20420401122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420401122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25627492800).

20420401122 is an abundant number, since it is smaller than the sum of its proper divisors (30834584478).

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

20420401122 is a wasteful number, since it uses less digits than its factorization.

20420401122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17768 (or 17765 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20420401122 its reverse (22110402402), we get a palindrome (42530803524).

The spelling of 20420401122 in words is "twenty billion, four hundred twenty million, four hundred one thousand, one hundred twenty-two".