20769563 has 6 divisors (see below), whose sum is σ = 22063476. Its totient is φ = 19547552.

The previous prime is 20769547. The next prime is 20769571. The reversal of 20769563 is 36596702.

It is not a de Polignac number, because 20769563 - 2⁴ = 20769547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20769533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35645 + ... + 36222.

It is an arithmetic number, because the mean of its divisors is an integer number (3677246).

Almost surely, 2^20769563 is an apocalyptic number.

20769563 is a deficient number, since it is larger than the sum of its proper divisors (1293913).

20769563 is an equidigital number, since it uses as much as digits as its factorization.

20769563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71901 (or 71884 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 20769563 is about 4557.3636019085. The cubic root of 20769563 is about 274.8795637916.

The spelling of 20769563 in words is "twenty million, seven hundred sixty-nine thousand, five hundred sixty-three".