20797786 has 8 divisors (see below), whose sum is σ = 31224564. Its totient is φ = 10389600.

The previous prime is 20797771. The next prime is 20797789. The reversal of 20797786 is 68779702.

It can be written as a sum of positive squares in 2 ways, for example, as 13875625 + 6922161 = 3725^2 + 2631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20797789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395 + ... + 6598.

Almost surely, 2^20797786 is an apocalyptic number.

20797786 is a deficient number, since it is larger than the sum of its proper divisors (10426778).

20797786 is a wasteful number, since it uses less digits than its factorization.

20797786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9296.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 20797786 is about 4560.4589681303. The cubic root of 20797786 is about 275.0040153684.

The spelling of 20797786 in words is "twenty million, seven hundred ninety-seven thousand, seven hundred eighty-six".