20768477 has 4 divisors (see below), whose sum is σ = 20888700. Its totient is φ = 20648256.

The previous prime is 20768467. The next prime is 20768479. The reversal of 20768477 is 77486702.

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 19545241 + 1223236 = 4421^2 + 1106^2 .

It is a cyclic number.

It is not a de Polignac number, because 20768477 - 2²⁴ = 3991261 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 (20768479) 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, 59852 + ... + 60197.

It is an arithmetic number, because the mean of its divisors is an integer number (5222175).

Almost surely, 2^20768477 is an apocalyptic number.

It is an amenable number.

20768477 is a deficient number, since it is larger than the sum of its proper divisors (120223).

20768477 is a wasteful number, since it uses less digits than its factorization.

20768477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120222.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 20768477 is about 4557.2444525173. The cubic root of 20768477 is about 274.8747727357.

The spelling of 20768477 in words is "twenty million, seven hundred sixty-eight thousand, four hundred seventy-seven".