20849620869 has 48 divisors (see below), whose sum is σ = 38255877504. Its totient is φ = 10626595200.

The previous prime is 20849620849. The next prime is 20849620889. The reversal of 20849620869 is 96802694802.

It is a happy number.

20849620869 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 9 + 620 + 8 + 6 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (20849620849) and next prime (20849620889).

It is not a de Polignac number, because 20849620869 - 2⁵ = 20849620837 is a prime.

It is a super-3 number, since 3×20849620869³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849620849) 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, 247102 + ... + 320559.

It is an arithmetic number, because the mean of its divisors is an integer number (796997448).

Almost surely, 2^20849620869 is an apocalyptic number.

It is an amenable number.

20849620869 is a deficient number, since it is larger than the sum of its proper divisors (17406256635).

20849620869 is a wasteful number, since it uses less digits than its factorization.

20849620869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567738 (or 567735 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 20849620869 in words is "twenty billion, eight hundred forty-nine million, six hundred twenty thousand, eight hundred sixty-nine".