20779486 has 64 divisors (see below), whose sum is σ = 41287680. Its totient is φ = 7620480.

The previous prime is 20779477. The next prime is 20779489. The reversal of 20779486 is 68497702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163555 + ... + 163681.

It is an arithmetic number, because the mean of its divisors is an integer number (645120).

Almost surely, 2^20779486 is an apocalyptic number.

20779486 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20779486 is a deficient number, since it is larger than the sum of its proper divisors (20508194).

20779486 is a wasteful number, since it uses less digits than its factorization.

20779486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20779486 is about 4558.4521495788. The cubic root of 20779486 is about 274.9233328980.

The spelling of 20779486 in words is "twenty million, seven hundred seventy-nine thousand, four hundred eighty-six".