20111023400 has 48 divisors (see below), whose sum is σ = 50354915100. Its totient is φ = 7425607680.

The previous prime is 20111023399. The next prime is 20111023463. The reversal of 20111023400 is 432011102.

It can be written as a sum of positive squares in 6 ways, for example, as 325225156 + 19785798244 = 18034^2 + 140662^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3864905 + ... + 3870104.

Almost surely, 2^20111023400 is an apocalyptic number.

20111023400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111023400 is an abundant number, since it is smaller than the sum of its proper divisors (30243891700).

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

20111023400 is a wasteful number, since it uses less digits than its factorization.

20111023400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7735038 (or 7735029 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20111023400 its reverse (432011102), we get a palindrome (20543034502).

The spelling of 20111023400 in words is "twenty billion, one hundred eleven million, twenty-three thousand, four hundred".