20591835012 has 192 divisors, whose sum is σ = 62589542400. Its totient is φ = 5732052480.

The previous prime is 20591834999. The next prime is 20591835013. The reversal of 20591835012 is 21053819502.

20591835012 is a `hidden beast` number, since 2 + 0 + 591 + 8 + 3 + 50 + 12 = 666.

It is a super-2 number, since 2×20591835012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20591835013) 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 63 ways as a sum of consecutive naturals, for example, 23372812 + ... + 23373692.

It is an arithmetic number, because the mean of its divisors is an integer number (325987200).

Almost surely, 2^20591835012 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 20591835012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31294771200).

20591835012 is an abundant number, since it is smaller than the sum of its proper divisors (41997707388).

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

20591835012 is a wasteful number, since it uses less digits than its factorization.

20591835012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 20591835012 in words is "twenty billion, five hundred ninety-one million, eight hundred thirty-five thousand, twelve".