20021855371870 has 16 divisors (see below), whose sum is σ = 39315643275888. Its totient is φ = 7280674680640.

The previous prime is 20021855371867. The next prime is 20021855371897. The reversal of 20021855371870 is 7817355812002.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 91008433399 + ... + 91008433618.

It is an arithmetic number, because the mean of its divisors is an integer number (2457227704743).

Almost surely, 2^{20021855371870} is an apocalyptic number.

20021855371870 is a deficient number, since it is larger than the sum of its proper divisors (19293787904018).

20021855371870 is a wasteful number, since it uses less digits than its factorization.

20021855371870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182016867035.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 20021855371870 in words is "twenty trillion, twenty-one billion, eight hundred fifty-five million, three hundred seventy-one thousand, eight hundred seventy".