4020204201985 has 4 divisors (see below), whose sum is σ = 4824245042388. Its totient is φ = 3216163361584.

The previous prime is 4020204201973. The next prime is 4020204202033. The reversal of 4020204201985 is 5891024020204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3081260643904 + 938943558081 = 1755352^2 + 968991^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020204201985 - 2¹³ = 4020204193793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402020420194 + ... + 402020420203.

It is an arithmetic number, because the mean of its divisors is an integer number (1206061260597).

Almost surely, 2^{4020204201985} is an apocalyptic number.

It is an amenable number.

4020204201985 is a deficient number, since it is larger than the sum of its proper divisors (804040840403).

4020204201985 is an equidigital number, since it uses as much as digits as its factorization.

4020204201985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804040840402.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 4020204201985 in words is "four trillion, twenty billion, two hundred four million, two hundred one thousand, nine hundred eighty-five".