20123211028 has 6 divisors (see below), whose sum is σ = 35215619306. Its totient is φ = 10061605512.

The previous prime is 20123211019. The next prime is 20123211029. The reversal of 20123211028 is 82011232102.

It can be written as a sum of positive squares in only one way, i.e., 18586414224 + 1536796804 = 136332^2 + 39202^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123211029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515401375 + ... + 2515401382.

Almost surely, 2^20123211028 is an apocalyptic number.

It is an amenable number.

20123211028 is a deficient number, since it is larger than the sum of its proper divisors (15092408278).

20123211028 is a wasteful number, since it uses less digits than its factorization.

20123211028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030802761 (or 5030802759 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 20123211028 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, twenty-eight".