20740821830 has 8 divisors (see below), whose sum is σ = 37333479312. Its totient is φ = 8296328728.

The previous prime is 20740821817. The next prime is 20740821847. The reversal of 20740821830 is 3812804702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037041082 + ... + 1037041101.

It is an arithmetic number, because the mean of its divisors is an integer number (4666684914).

Almost surely, 2^20740821830 is an apocalyptic number.

20740821830 is a deficient number, since it is larger than the sum of its proper divisors (16592657482).

20740821830 is a wasteful number, since it uses less digits than its factorization.

20740821830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074082190.

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 20740821830 in words is "twenty billion, seven hundred forty million, eight hundred twenty-one thousand, eight hundred thirty".