20401111001 has 8 divisors (see below), whose sum is σ = 21610621800. Its totient is φ = 19192649728.

The previous prime is 20401110997. The next prime is 20401111013. The reversal of 20401111001 is 10011110402.

It can be written as a sum of positive squares in 4 ways, for example, as 1094286400 + 19306824601 = 33080^2 + 138949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20401111001 - 2² = 20401110997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20401111201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222176 + ... + 300273.

It is an arithmetic number, because the mean of its divisors is an integer number (2701327725).

Almost surely, 2^20401111001 is an apocalyptic number.

It is an amenable number.

20401111001 is a deficient number, since it is larger than the sum of its proper divisors (1209510799).

20401111001 is a wasteful number, since it uses less digits than its factorization.

20401111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524763.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20401111001 its reverse (10011110402), we get a palindrome (30412221403).

The spelling of 20401111001 in words is "twenty billion, four hundred one million, one hundred eleven thousand, one".