20111331020 has 48 divisors (see below), whose sum is σ = 47053536768. Its totient is φ = 7157607360.

The previous prime is 20111330969. The next prime is 20111331047. The reversal of 20111331020 is 2013311102.

It is a junction number, because it is equal to n+sod(n) for n = 20111330986 and 20111331004.

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 15 ways as a sum of consecutive naturals, for example, 962162 + ... + 982841.

It is an arithmetic number, because the mean of its divisors is an integer number (980282016).

Almost surely, 2^20111331020 is an apocalyptic number.

20111331020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111331020 is an abundant number, since it is smaller than the sum of its proper divisors (26942205748).

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

20111331020 is a wasteful number, since it uses less digits than its factorization.

20111331020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945070 (or 1945068 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20111331020 its reverse (2013311102), we get a palindrome (22124642122).

The spelling of 20111331020 in words is "twenty billion, one hundred eleven million, three hundred thirty-one thousand, twenty".