20669349519 has 48 divisors (see below), whose sum is σ = 38679513600. Its totient is φ = 10328689728.

The previous prime is 20669349517. The next prime is 20669349523. The reversal of 20669349519 is 91594396602.

20669349519 is a `hidden beast` number, since 2 + 0 + 66 + 93 + 495 + 1 + 9 = 666.

It is not a de Polignac number, because 20669349519 - 2¹ = 20669349517 is a prime.

It is a super-2 number, since 2×20669349519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669349517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 648579 + ... + 679700.

It is an arithmetic number, because the mean of its divisors is an integer number (805823200).

Almost surely, 2^20669349519 is an apocalyptic number.

20669349519 is a deficient number, since it is larger than the sum of its proper divisors (18010164081).

20669349519 is a wasteful number, since it uses less digits than its factorization.

20669349519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328324 (or 1328321 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 20669349519 in words is "twenty billion, six hundred sixty-nine million, three hundred forty-nine thousand, five hundred nineteen".