20112320129 has 4 divisors (see below), whose sum is σ = 21940712880. Its totient is φ = 18283927380.

The previous prime is 20112320119. The next prime is 20112320131. The reversal of 20112320129 is 92102321102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20112320129 - 2³² = 15817352833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112320119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914196359 + ... + 914196380.

It is an arithmetic number, because the mean of its divisors is an integer number (5485178220).

Almost surely, 2^20112320129 is an apocalyptic number.

It is an amenable number.

20112320129 is a deficient number, since it is larger than the sum of its proper divisors (1828392751).

20112320129 is a wasteful number, since it uses less digits than its factorization.

20112320129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828392750.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 20112320129 in words is "twenty billion, one hundred twelve million, three hundred twenty thousand, one hundred twenty-nine".