20401811712 has 144 divisors (see below), whose sum is σ = 60642046080. Its totient is φ = 6765631488.

The previous prime is 20401811701. The next prime is 20401811713. The reversal of 20401811712 is 21711810402.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×20401811712² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20401811713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1354173 + ... + 1369155.

It is an arithmetic number, because the mean of its divisors is an integer number (421125320).

Almost surely, 2^20401811712 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 20401811712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30321023040).

20401811712 is an abundant number, since it is smaller than the sum of its proper divisors (40240234368).

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

20401811712 is a wasteful number, since it uses less digits than its factorization.

20401811712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15205 (or 15185 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The spelling of 20401811712 in words is "twenty billion, four hundred one million, eight hundred eleven thousand, seven hundred twelve".