20013603544 has 64 divisors (see below), whose sum is σ = 41913676800. Its totient is φ = 8881017600.

The previous prime is 20013603509. The next prime is 20013603551. The reversal of 20013603544 is 44530631002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685709 + ... + 1697539.

It is an arithmetic number, because the mean of its divisors is an integer number (654901200).

Almost surely, 2^20013603544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20013603544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956838400).

20013603544 is an abundant number, since it is smaller than the sum of its proper divisors (21900073256).

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

20013603544 is a wasteful number, since it uses less digits than its factorization.

20013603544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12304 (or 12300 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 20013603544 in words is "twenty billion, thirteen million, six hundred three thousand, five hundred forty-four".