20677403 has 4 divisors (see below), whose sum is σ = 21344448. Its totient is φ = 20010360.

The previous prime is 20677387. The next prime is 20677411. The reversal of 20677403 is 30477602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20677403 - 2⁴ = 20677387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20677463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333476 + ... + 333537.

It is an arithmetic number, because the mean of its divisors is an integer number (5336112).

Almost surely, 2^20677403 is an apocalyptic number.

20677403 is a deficient number, since it is larger than the sum of its proper divisors (667045).

20677403 is an equidigital number, since it uses as much as digits as its factorization.

20677403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667044.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 20677403 is about 4547.2412515722. The cubic root of 20677403 is about 274.4723900375.

The spelling of 20677403 in words is "twenty million, six hundred seventy-seven thousand, four hundred three".