20018619 has 12 divisors (see below), whose sum is σ = 29621592. Its totient is φ = 13020000.

The previous prime is 20018617. The next prime is 20018651. The reversal of 20018619 is 91681002.

It is not a de Polignac number, because 20018619 - 2¹ = 20018617 is a prime.

It is a super-2 number, since 2×20018619² = 801490213334322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20018592 and 20018601.

It is not an unprimeable number, because it can be changed into a prime (20018617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26757 + ... + 27494.

It is an arithmetic number, because the mean of its divisors is an integer number (2468466).

Almost surely, 2^20018619 is an apocalyptic number.

20018619 is a deficient number, since it is larger than the sum of its proper divisors (9602973).

20018619 is a wasteful number, since it uses less digits than its factorization.

20018619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54298 (or 54295 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20018619 is about 4474.2171382265. The cubic root of 20018619 is about 271.5259684368.

The spelling of 20018619 in words is "twenty million, eighteen thousand, six hundred nineteen".