20783720134 has 8 divisors (see below), whose sum is σ = 31178035800. Its totient is φ = 10391041536.

The previous prime is 20783720119. The next prime is 20783720143. The reversal of 20783720134 is 43102738702.

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

It is a super-3 number, since 3×20783720134³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20783720093 and 20783720102.

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, 377019 + ... + 428614.

It is an arithmetic number, because the mean of its divisors is an integer number (3897254475).

Almost surely, 2^20783720134 is an apocalyptic number.

20783720134 is a deficient number, since it is larger than the sum of its proper divisors (10394315666).

20783720134 is a wasteful number, since it uses less digits than its factorization.

20783720134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818534.

The product of its (nonzero) digits is 56448, while the sum is 37.

The spelling of 20783720134 in words is "twenty billion, seven hundred eighty-three million, seven hundred twenty thousand, one hundred thirty-four".