20401110072 has 48 divisors (see below), whose sum is σ = 63146294640. Its totient is φ = 5828888448.

The previous prime is 20401110071. The next prime is 20401110077. The reversal of 20401110072 is 27001110402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401110071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20238693 + ... + 20239700.

It is an arithmetic number, because the mean of its divisors is an integer number (1315547805).

Almost surely, 2^20401110072 is an apocalyptic number.

It is an amenable number.

20401110072 is an abundant number, since it is smaller than the sum of its proper divisors (42745184568).

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

20401110072 is a wasteful number, since it uses less digits than its factorization.

20401110072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40478412 (or 40478405 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

Adding to 20401110072 its reverse (27001110402), we get a palindrome (47402220474).

The spelling of 20401110072 in words is "twenty billion, four hundred one million, one hundred ten thousand, seventy-two".