20861428783 has 12 divisors (see below), whose sum is σ = 22599965640. Its totient is φ = 19247862816.

The previous prime is 20861428771. The next prime is 20861428787. The reversal of 20861428783 is 38782416802.

It is a de Polignac number, because none of the positive numbers 2^k-20861428783 is a prime.

It is a super-2 number, since 2×20861428783² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861428787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356260 + ... + 410662.

It is an arithmetic number, because the mean of its divisors is an integer number (1883330470).

Almost surely, 2^20861428783 is an apocalyptic number.

20861428783 is a deficient number, since it is larger than the sum of its proper divisors (1738536857).

20861428783 is a wasteful number, since it uses less digits than its factorization.

20861428783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56698 (or 56685 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 20861428783 in words is "twenty billion, eight hundred sixty-one million, four hundred twenty-eight thousand, seven hundred eighty-three".