20401024320 has 84 divisors (see below), whose sum is σ = 70171033140. Its totient is φ = 5440272384.

The previous prime is 20401024297. The next prime is 20401024321. The reversal of 20401024320 is 2342010402.

20401024320 is a `hidden beast` number, since 2 + 0 + 401 + 0 + 243 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3065615424 + 17335408896 = 55368^2 + 131664^2 .

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 = 20401024293 and 20401024302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401024321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3538965 + ... + 3544724.

Almost surely, 2^20401024320 is an apocalyptic number.

20401024320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401024320 is an abundant number, since it is smaller than the sum of its proper divisors (49770008820).

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

20401024320 is a wasteful number, since it uses less digits than its factorization.

20401024320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083712 (or 7083699 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20401024320 its reverse (2342010402), we get a palindrome (22743034722).

The spelling of 20401024320 in words is "twenty billion, four hundred one million, twenty-four thousand, three hundred twenty".