20401401020 has 144 divisors (see below), whose sum is σ = 57959799744. Its totient is φ = 5869670400.

The previous prime is 20401401019. The next prime is 20401401037. The reversal of 20401401020 is 2010410402.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20401400986 and 20401401004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173900 + ... + 266540.

Almost surely, 2^20401401020 is an apocalyptic number.

20401401020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20401401020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28979899872).

20401401020 is an abundant number, since it is smaller than the sum of its proper divisors (37558398724).

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

20401401020 is a wasteful number, since it uses less digits than its factorization.

20401401020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92692 (or 92679 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20401401020 its reverse (2010410402), we get a palindrome (22411811422).

The spelling of 20401401020 in words is "twenty billion, four hundred one million, four hundred one thousand, twenty".