20401331340 has 192 divisors, whose sum is σ = 63027974016. Its totient is φ = 4899667968.

The previous prime is 20401331297. The next prime is 20401331351. The reversal of 20401331340 is 4313310402.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7977342 + ... + 7979898.

It is an arithmetic number, because the mean of its divisors is an integer number (328270698).

Almost surely, 2^20401331340 is an apocalyptic number.

20401331340 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 20401331340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31513987008).

20401331340 is an abundant number, since it is smaller than the sum of its proper divisors (42626642676).

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

20401331340 is a wasteful number, since it uses less digits than its factorization.

20401331340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828 (or 2826 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20401331340 its reverse (4313310402), we get a palindrome (24714641742).

The spelling of 20401331340 in words is "twenty billion, four hundred one million, three hundred thirty-one thousand, three hundred forty".