20674838709 has 24 divisors (see below), whose sum is σ = 35008365120. Its totient is φ = 11813063976.

The previous prime is 20674838707. The next prime is 20674838731. The reversal of 20674838709 is 90783847602.

20674838709 is a `hidden beast` number, since 20 + 67 + 483 + 87 + 0 + 9 = 666.

It is not a de Polignac number, because 20674838709 - 2¹ = 20674838707 is a prime.

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 (20674838707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1971522 + ... + 1981980.

It is an arithmetic number, because the mean of its divisors is an integer number (1458681880).

Almost surely, 2^20674838709 is an apocalyptic number.

It is an amenable number.

20674838709 is a deficient number, since it is larger than the sum of its proper divisors (14333526411).

20674838709 is an frugal number, since it uses more digits than its factorization.

20674838709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20934 (or 10469 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 20674838709 in words is "twenty billion, six hundred seventy-four million, eight hundred thirty-eight thousand, seven hundred nine".