20711561142 has 16 divisors (see below), whose sum is σ = 43859776752. Its totient is φ = 6497744640.

The previous prime is 20711561099. The next prime is 20711561147. The reversal of 20711561142 is 24116511702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20711561147) 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 7 ways as a sum of consecutive naturals, for example, 101527159 + ... + 101527362.

It is an arithmetic number, because the mean of its divisors is an integer number (2741236047).

Almost surely, 2^20711561142 is an apocalyptic number.

20711561142 is an abundant number, since it is smaller than the sum of its proper divisors (23148215610).

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

20711561142 is a wasteful number, since it uses less digits than its factorization.

20711561142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203054543.

The product of its (nonzero) digits is 3360, while the sum is 30.

The spelling of 20711561142 in words is "twenty billion, seven hundred eleven million, five hundred sixty-one thousand, one hundred forty-two".