20849181012 has 144 divisors (see below), whose sum is σ = 59146214400. Its totient is φ = 6138262080.

The previous prime is 20849180983. The next prime is 20849181049. The reversal of 20849181012 is 21018194802.

It is a happy number.

It is a super-2 number, since 2×20849181012² (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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2583039 + ... + 2591097.

It is an arithmetic number, because the mean of its divisors is an integer number (410737600).

Almost surely, 2^20849181012 is an apocalyptic number.

20849181012 is a gapful number since it is divisible by the number (22) 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 20849181012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29573107200).

20849181012 is an abundant number, since it is smaller than the sum of its proper divisors (38297033388).

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

20849181012 is a wasteful number, since it uses less digits than its factorization.

20849181012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8266 (or 8261 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 20849181012 in words is "twenty billion, eight hundred forty-nine million, one hundred eighty-one thousand, twelve".