20751677 has 4 divisors (see below), whose sum is σ = 20891100. Its totient is φ = 20612256.

The previous prime is 20751631. The next prime is 20751683. The reversal of 20751677 is 77615702.

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 13293316 + 7458361 = 3646^2 + 2731^2 .

It is a cyclic number.

It is not a de Polignac number, because 20751677 - 2⁶ = 20751613 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 (20751607) 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, 69488 + ... + 69785.

It is an arithmetic number, because the mean of its divisors is an integer number (5222775).

Almost surely, 2^20751677 is an apocalyptic number.

It is an amenable number.

20751677 is a deficient number, since it is larger than the sum of its proper divisors (139423).

20751677 is a wasteful number, since it uses less digits than its factorization.

20751677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139422.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 20751677 is about 4555.4008605171. The cubic root of 20751677 is about 274.8006356688.

The spelling of 20751677 in words is "twenty million, seven hundred fifty-one thousand, six hundred seventy-seven".