20745677 has 4 divisors (see below), whose sum is σ = 20860476. Its totient is φ = 20630880.

The previous prime is 20745667. The next prime is 20745691. The reversal of 20745677 is 77654702.

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 2886601 + 17859076 = 1699^2 + 4226^2 .

It is a cyclic number.

It is not a de Polignac number, because 20745677 - 2⁸ = 20745421 is a prime.

It is a super-2 number, since 2×20745677² = 860766228376658, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20745677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745667) 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, 57128 + ... + 57489.

It is an arithmetic number, because the mean of its divisors is an integer number (5215119).

Almost surely, 2^20745677 is an apocalyptic number.

It is an amenable number.

20745677 is a deficient number, since it is larger than the sum of its proper divisors (114799).

20745677 is a wasteful number, since it uses less digits than its factorization.

20745677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114798.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 20745677 is about 4554.7422539591. The cubic root of 20745677 is about 274.7741484481.

The spelling of 20745677 in words is "twenty million, seven hundred forty-five thousand, six hundred seventy-seven".