20780784031 has 16 divisors (see below), whose sum is σ = 24338377728. Its totient is φ = 17370763200.

The previous prime is 20780783983. The next prime is 20780784041. The reversal of 20780784031 is 13048708702.

It is not a de Polignac number, because 20780784031 - 2⁹ = 20780783519 is a prime.

It is a super-2 number, since 2×20780784031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780784041) 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 15 ways as a sum of consecutive naturals, for example, 788046 + ... + 813988.

It is an arithmetic number, because the mean of its divisors is an integer number (1521148608).

Almost surely, 2^20780784031 is an apocalyptic number.

20780784031 is a deficient number, since it is larger than the sum of its proper divisors (3557593697).

20780784031 is a wasteful number, since it uses less digits than its factorization.

20780784031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28782.

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 20780784031 in words is "twenty billion, seven hundred eighty million, seven hundred eighty-four thousand, thirty-one".