20712277 has 4 divisors (see below), whose sum is σ = 20740396. Its totient is φ = 20684160.

The previous prime is 20712271. The next prime is 20712281. The reversal of 20712277 is 77221702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12680721 + 8031556 = 3561^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712277 - 2¹⁵ = 20679509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712271) 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, 12924 + ... + 14437.

It is an arithmetic number, because the mean of its divisors is an integer number (5185099).

Almost surely, 2^20712277 is an apocalyptic number.

It is an amenable number.

20712277 is a deficient number, since it is larger than the sum of its proper divisors (28119).

20712277 is an equidigital number, since it uses as much as digits as its factorization.

20712277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28118.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 20712277 is about 4551.0742687853. The cubic root of 20712277 is about 274.6266094994.

Adding to 20712277 its reverse (77221702), we get a palindrome (97933979).

The spelling of 20712277 in words is "twenty million, seven hundred twelve thousand, two hundred seventy-seven".