20201220100019 has 24 divisors (see below), whose sum is σ = 24718171115520. Its totient is φ = 16168461273216.

The previous prime is 20201220099971. The next prime is 20201220100043. The reversal of 20201220100019 is 91000102210202.

It is a happy number.

It is not a de Polignac number, because 20201220100019 - 2¹² = 20201220095923 is a prime.

It is a super-2 number, since 2×20201220100019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201220100319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39057149 + ... + 39570990.

It is an arithmetic number, because the mean of its divisors is an integer number (1029923796480).

Almost surely, 2^{20201220100019} is an apocalyptic number.

20201220100019 is a deficient number, since it is larger than the sum of its proper divisors (4516951015501).

20201220100019 is a wasteful number, since it uses less digits than its factorization.

20201220100019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78628307 (or 78628290 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 20201220100019 in words is "twenty trillion, two hundred one billion, two hundred twenty million, one hundred thousand, nineteen".