20936477 has 4 divisors (see below), whose sum is σ = 21089436. Its totient is φ = 20783520.

The previous prime is 20936471. The next prime is 20936483. The reversal of 20936477 is 77463902.

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

It is an interprime number because it is at equal distance from previous prime (20936471) and next prime (20936483).

It can be written as a sum of positive squares in 2 ways, for example, as 11363641 + 9572836 = 3371^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 20936477 - 2¹⁸ = 20674333 is a prime.

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 20936477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76274 + ... + 76547.

It is an arithmetic number, because the mean of its divisors is an integer number (5272359).

Almost surely, 2^20936477 is an apocalyptic number.

It is an amenable number.

20936477 is a deficient number, since it is larger than the sum of its proper divisors (152959).

20936477 is a wasteful number, since it uses less digits than its factorization.

20936477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152958.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20936477 is about 4575.6395181439. The cubic root of 20936477 is about 275.6139539110.

The spelling of 20936477 in words is "twenty million, nine hundred thirty-six thousand, four hundred seventy-seven".