20401123311 has 6 divisors (see below), whose sum is σ = 29468289240. Its totient is φ = 13600748868.

The previous prime is 20401123247. The next prime is 20401123331. The reversal of 20401123311 is 11332110402.

20401123311 is a `hidden beast` number, since 20 + 401 + 1 + 233 + 11 = 666.

It is not a de Polignac number, because 20401123311 - 2⁶ = 20401123247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401123331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1133395731 + ... + 1133395748.

It is an arithmetic number, because the mean of its divisors is an integer number (4911381540).

Almost surely, 2^20401123311 is an apocalyptic number.

20401123311 is a deficient number, since it is larger than the sum of its proper divisors (9067165929).

20401123311 is a wasteful number, since it uses less digits than its factorization.

20401123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266791485 (or 2266791482 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20401123311 its reverse (11332110402), we get a palindrome (31733233713).

The spelling of 20401123311 in words is "twenty billion, four hundred one million, one hundred twenty-three thousand, three hundred eleven".