20780571442 has 8 divisors (see below), whose sum is σ = 32013312876. Its totient is φ = 10109467152.

The previous prime is 20780571439. The next prime is 20780571443. The reversal of 20780571442 is 24417508702.

It can be written as a sum of positive squares in 2 ways, for example, as 20334474801 + 446096641 = 142599^2 + 21121^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20780571395 and 20780571404.

It is not an unprimeable number, because it can be changed into a prime (20780571443) by changing a digit.

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, 140409193 + ... + 140409340.

Almost surely, 2^20780571442 is an apocalyptic number.

20780571442 is a deficient number, since it is larger than the sum of its proper divisors (11232741434).

20780571442 is a wasteful number, since it uses less digits than its factorization.

20780571442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280818572.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 20780571442 in words is "twenty billion, seven hundred eighty million, five hundred seventy-one thousand, four hundred forty-two".