20779530 has 16 divisors (see below), whose sum is σ = 49870944. Its totient is φ = 5541200.

The previous prime is 20779489. The next prime is 20779531. The reversal of 20779530 is 3597702.

It is a junction number, because it is equal to n+sod(n) for n = 20779491 and 20779500.

It is not an unprimeable number, because it can be changed into a prime (20779531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346296 + ... + 346355.

It is an arithmetic number, because the mean of its divisors is an integer number (3116934).

Almost surely, 2^20779530 is an apocalyptic number.

20779530 is an abundant number, since it is smaller than the sum of its proper divisors (29091414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20779530 is a wasteful number, since it uses less digits than its factorization.

20779530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692661.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20779530 is about 4558.4569757759. The cubic root of 20779530 is about 274.9235269454.

The spelling of 20779530 in words is "twenty million, seven hundred seventy-nine thousand, five hundred thirty".