20011231404 has 72 divisors (see below), whose sum is σ = 52465799568. Its totient is φ = 6425827200.

The previous prime is 20011231399. The next prime is 20011231447. The reversal of 20011231404 is 40413211002.

20011231404 is a `hidden beast` number, since 20 + 0 + 11 + 231 + 404 = 666.

It is a super-2 number, since 2×20011231404² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60159 + ... + 208905.

Almost surely, 2^20011231404 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 20011231404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26232899784).

20011231404 is an abundant number, since it is smaller than the sum of its proper divisors (32454568164).

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

20011231404 is a wasteful number, since it uses less digits than its factorization.

20011231404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148895 (or 148890 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20011231404 its reverse (40413211002), we get a palindrome (60424442406).

The spelling of 20011231404 in words is "twenty billion, eleven million, two hundred thirty-one thousand, four hundred four".