20129971279 has 12 divisors (see below), whose sum is σ = 22140066312. Its totient is φ = 18288614960.

The previous prime is 20129971261. The next prime is 20129971319. The reversal of 20129971279 is 97217992102.

It is not a de Polignac number, because 20129971279 - 2¹⁵ = 20129938511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129971229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147264 + ... + 248890.

It is an arithmetic number, because the mean of its divisors is an integer number (1845005526).

Almost surely, 2^20129971279 is an apocalyptic number.

20129971279 is a deficient number, since it is larger than the sum of its proper divisors (2010095033).

20129971279 is a wasteful number, since it uses less digits than its factorization.

20129971279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103286 (or 103275 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 49.

The spelling of 20129971279 in words is "twenty billion, one hundred twenty-nine million, nine hundred seventy-one thousand, two hundred seventy-nine".