20156571142 has 8 divisors (see below), whose sum is σ = 30275118432. Its totient is φ = 10064865000.

The previous prime is 20156571131. The next prime is 20156571151. The reversal of 20156571142 is 24117565102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20156571098 and 20156571107.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6708409 + ... + 6711412.

It is an arithmetic number, because the mean of its divisors is an integer number (3784389804).

Almost surely, 2^20156571142 is an apocalyptic number.

20156571142 is a deficient number, since it is larger than the sum of its proper divisors (10118547290).

20156571142 is a wasteful number, since it uses less digits than its factorization.

20156571142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13420574.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 20156571142 in words is "twenty billion, one hundred fifty-six million, five hundred seventy-one thousand, one hundred forty-two".