20401343120 has 40 divisors (see below), whose sum is σ = 48536226816. Its totient is φ = 7970755968.

The previous prime is 20401343117. The next prime is 20401343129. The reversal of 20401343120 is 2134310402.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20401343092 and 20401343101.

It is not an unprimeable number, because it can be changed into a prime (20401343129) by changing a digit.

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, 2961872 + ... + 2968751.

Almost surely, 2^20401343120 is an apocalyptic number.

20401343120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401343120 is an abundant number, since it is smaller than the sum of its proper divisors (28134883696).

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

20401343120 is a wasteful number, since it uses less digits than its factorization.

20401343120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5930679 (or 5930673 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20401343120 its reverse (2134310402), we get a palindrome (22535653522).

The spelling of 20401343120 in words is "twenty billion, four hundred one million, three hundred forty-three thousand, one hundred twenty".