20911111940 has 24 divisors (see below), whose sum is σ = 45822611520. Its totient is φ = 8000773088.

The previous prime is 20911111939. The next prime is 20911111943. The reversal of 20911111940 is 4911111902.

It is not an unprimeable number, because it can be changed into a prime (20911111943) 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, 22729010 + ... + 22729929.

It is an arithmetic number, because the mean of its divisors is an integer number (1909275480).

Almost surely, 2^20911111940 is an apocalyptic number.

20911111940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20911111940 is an abundant number, since it is smaller than the sum of its proper divisors (24911499580).

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

20911111940 is a wasteful number, since it uses less digits than its factorization.

20911111940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45458971 (or 45458969 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 20911111940 in words is "twenty billion, nine hundred eleven million, one hundred eleven thousand, nine hundred forty".