20123211056 has 20 divisors (see below), whose sum is σ = 41987854272. Its totient is φ = 9287635776.

The previous prime is 20123211029. The next prime is 20123211067. The reversal of 20123211056 is 65011232102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48372896 + ... + 48373311.

Almost surely, 2^20123211056 is an apocalyptic number.

20123211056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20123211056 is an abundant number, since it is smaller than the sum of its proper divisors (21864643216).

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

20123211056 is a wasteful number, since it uses less digits than its factorization.

20123211056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96746228 (or 96746222 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 20123211056 its reverse (65011232102), we get a palindrome (85134443158).

The spelling of 20123211056 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, fifty-six".