20818860619 has 16 divisors (see below), whose sum is σ = 22740701184. Its totient is φ = 18999842400.

The previous prime is 20818860611. The next prime is 20818860631. The reversal of 20818860619 is 91606881802.

It is a cyclic number.

It is not a de Polignac number, because 20818860619 - 2³ = 20818860611 is a prime.

It is a super-2 number, since 2×20818860619² (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 (20818860611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155004 + ... + 256249.

It is an arithmetic number, because the mean of its divisors is an integer number (1421293824).

Almost surely, 2^20818860619 is an apocalyptic number.

20818860619 is a deficient number, since it is larger than the sum of its proper divisors (1921840565).

20818860619 is a wasteful number, since it uses less digits than its factorization.

20818860619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411378.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 20818860619 in words is "twenty billion, eight hundred eighteen million, eight hundred sixty thousand, six hundred nineteen".