20401220240 has 40 divisors (see below), whose sum is σ = 47452911480. Its totient is φ = 8157034496.

The previous prime is 20401220207. The next prime is 20401220251. The reversal of 20401220240 is 4202210402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8919669136 + 11481551104 = 94444^2 + 107152^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140606 + ... + 246114.

It is an arithmetic number, because the mean of its divisors is an integer number (1186322787).

Almost surely, 2^20401220240 is an apocalyptic number.

20401220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401220240 is an abundant number, since it is smaller than the sum of its proper divisors (27051691240).

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

20401220240 is a wasteful number, since it uses less digits than its factorization.

20401220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107939 (or 107933 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20401220240 its reverse (4202210402), we get a palindrome (24603430642).

The spelling of 20401220240 in words is "twenty billion, four hundred one million, two hundred twenty thousand, two hundred forty".