20059491816 has 288 divisors, whose sum is σ = 68358850560. Its totient is φ = 5267130624.

The previous prime is 20059491797. The next prime is 20059491827. The reversal of 20059491816 is 61819495002.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12061401 + ... + 12063063.

It is an arithmetic number, because the mean of its divisors is an integer number (237357120).

Almost surely, 2^20059491816 is an apocalyptic number.

20059491816 is a gapful number since it is divisible by the number (26) 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 20059491816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34179425280).

20059491816 is an abundant number, since it is smaller than the sum of its proper divisors (48299358744).

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

20059491816 is a wasteful number, since it uses less digits than its factorization.

20059491816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 20059491816 in words is "twenty billion, fifty-nine million, four hundred ninety-one thousand, eight hundred sixteen".