20155440700 has 72 divisors (see below), whose sum is σ = 44296227360. Its totient is φ = 7959686400.

The previous prime is 20155440689. The next prime is 20155440709. The reversal of 20155440700 is 704455102.

It is a super-2 number, since 2×20155440700² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155440709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3190545 + ... + 3196855.

It is an arithmetic number, because the mean of its divisors is an integer number (615225380).

Almost surely, 2^20155440700 is an apocalyptic number.

20155440700 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 20155440700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22148113680).

20155440700 is an abundant number, since it is smaller than the sum of its proper divisors (24140786660).

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

20155440700 is a wasteful number, since it uses less digits than its factorization.

20155440700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727 (or 6720 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

Adding to 20155440700 its reverse (704455102), we get a palindrome (20859895802).

The spelling of 20155440700 in words is "twenty billion, one hundred fifty-five million, four hundred forty thousand, seven hundred".