20849199489 has 12 divisors (see below), whose sum is σ = 30221929296. Its totient is φ = 13850349912.

The previous prime is 20849199479. The next prime is 20849199509. The reversal of 20849199489 is 98499194802.

20849199489 is a `hidden beast` number, since 20 + 8 + 49 + 1 + 99 + 489 = 666.

It is not a de Polignac number, because 20849199489 - 2⁵ = 20849199457 is a prime.

It is a super-2 number, since 2×20849199489² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20849199409) 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, 4090347 + ... + 4095440.

It is an arithmetic number, because the mean of its divisors is an integer number (2518494108).

Almost surely, 2^20849199489 is an apocalyptic number.

It is an amenable number.

20849199489 is a deficient number, since it is larger than the sum of its proper divisors (9372729807).

20849199489 is a wasteful number, since it uses less digits than its factorization.

20849199489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8186076 (or 8186073 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 20849199489 in words is "twenty billion, eight hundred forty-nine million, one hundred ninety-nine thousand, four hundred eighty-nine".