20771677 has 4 divisors (see below), whose sum is σ = 20985916. Its totient is φ = 20557440.

The previous prime is 20771657. The next prime is 20771683. The reversal of 20771677 is 77617702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77617702 = 2 ⋅38808851.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 10621081 = 3186^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 20771677 - 2¹⁹ = 20247389 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 (20771657) 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, 106974 + ... + 107167.

It is an arithmetic number, because the mean of its divisors is an integer number (5246479).

Almost surely, 2^20771677 is an apocalyptic number.

It is an amenable number.

20771677 is a deficient number, since it is larger than the sum of its proper divisors (214239).

20771677 is an equidigital number, since it uses as much as digits as its factorization.

20771677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214238.

The product of its (nonzero) digits is 28812, while the sum is 37.

The square root of 20771677 is about 4557.5955283461. The cubic root of 20771677 is about 274.8888895485. Note that the first 5 decimals are identical.

The spelling of 20771677 in words is "twenty million, seven hundred seventy-one thousand, six hundred seventy-seven".