20677543 has 8 divisors (see below), whose sum is σ = 21098880. Its totient is φ = 20259960.

The previous prime is 20677537. The next prime is 20677549. The reversal of 20677543 is 34577602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20677537) and next prime (20677549).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20677543 - 2²¹ = 18580391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20677499 and 20677508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20677549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11896 + ... + 13522.

It is an arithmetic number, because the mean of its divisors is an integer number (2637360).

Almost surely, 2^20677543 is an apocalyptic number.

20677543 is a deficient number, since it is larger than the sum of its proper divisors (421337).

20677543 is a wasteful number, since it uses less digits than its factorization.

20677543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 20677543 is about 4547.2566454952. The cubic root of 20677543 is about 274.4730094906.

The spelling of 20677543 in words is "twenty million, six hundred seventy-seven thousand, five hundred forty-three".