20145554219 has 4 divisors (see below), whose sum is σ = 23023490544. Its totient is φ = 17267617896.

The previous prime is 20145554201. The next prime is 20145554239. The reversal of 20145554219 is 91245554102.

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

It is a cyclic number.

It is not a de Polignac number, because 20145554219 - 2²⁸ = 19877118763 is a prime.

It is a super-2 number, since 2×20145554219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145554239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438968152 + ... + 1438968165.

It is an arithmetic number, because the mean of its divisors is an integer number (5755872636).

Almost surely, 2^20145554219 is an apocalyptic number.

20145554219 is a deficient number, since it is larger than the sum of its proper divisors (2877936325).

20145554219 is an equidigital number, since it uses as much as digits as its factorization.

20145554219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877936324.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 20145554219 in words is "twenty billion, one hundred forty-five million, five hundred fifty-four thousand, two hundred nineteen".