20155400544 has 96 divisors (see below), whose sum is σ = 53382551040. Its totient is φ = 6658368512.

The previous prime is 20155400471. The next prime is 20155400567. The reversal of 20155400544 is 44500455102.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12927637 + ... + 12929195.

It is an arithmetic number, because the mean of its divisors is an integer number (556068240).

Almost surely, 2^20155400544 is an apocalyptic number.

20155400544 is a gapful number since it is divisible by the number (24) 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 20155400544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26691275520).

20155400544 is an abundant number, since it is smaller than the sum of its proper divisors (33227150496).

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

20155400544 is a wasteful number, since it uses less digits than its factorization.

20155400544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692 (or 2684 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 20155400544 its reverse (44500455102), we get a palindrome (64655855646).

The spelling of 20155400544 in words is "twenty billion, one hundred fifty-five million, four hundred thousand, five hundred forty-four".