20291911101 has 128 divisors (see below), whose sum is σ = 38881382400. Its totient is φ = 10280649600.

The previous prime is 20291911049. The next prime is 20291911109. The reversal of 20291911101 is 10111919202.

It is not a de Polignac number, because 20291911101 - 2¹⁵ = 20291878333 is a prime.

It is a super-2 number, since 2×20291911101² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20291911109) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6902890 + ... + 6905828.

It is an arithmetic number, because the mean of its divisors is an integer number (303760800).

Almost surely, 2^20291911101 is an apocalyptic number.

20291911101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20291911101 is a deficient number, since it is larger than the sum of its proper divisors (18589471299).

20291911101 is an equidigital number, since it uses as much as digits as its factorization.

20291911101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019 (or 3001 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 20291911101 in words is "twenty billion, two hundred ninety-one million, nine hundred eleven thousand, one hundred one".