20979145743 has 32 divisors (see below), whose sum is σ = 29038225920. Its totient is φ = 13461655680.

The previous prime is 20979145727. The next prime is 20979145777. The reversal of 20979145743 is 34754197902.

It is a happy number.

It is not a de Polignac number, because 20979145743 - 2⁴ = 20979145727 is a prime.

It is a super-2 number, since 2×20979145743² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979145643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11456838 + ... + 11458668.

It is an arithmetic number, because the mean of its divisors is an integer number (907444560).

Almost surely, 2^20979145743 is an apocalyptic number.

20979145743 is a deficient number, since it is larger than the sum of its proper divisors (8059080177).

20979145743 is a wasteful number, since it uses less digits than its factorization.

20979145743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 20979145743 in words is "twenty billion, nine hundred seventy-nine million, one hundred forty-five thousand, seven hundred forty-three".