20994763 has 4 divisors (see below), whose sum is σ = 21057400. Its totient is φ = 20932128.

The previous prime is 20994749. The next prime is 20994821. The reversal of 20994763 is 36749902.

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 20994763 - 2¹³ = 20986571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20994703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30813 + ... + 31486.

It is an arithmetic number, because the mean of its divisors is an integer number (5264350).

Almost surely, 2^20994763 is an apocalyptic number.

20994763 is a deficient number, since it is larger than the sum of its proper divisors (62637).

20994763 is an equidigital number, since it uses as much as digits as its factorization.

20994763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62636.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 20994763 is about 4582.0042557815. The cubic root of 20994763 is about 275.8694816268.

The spelling of 20994763 in words is "twenty million, nine hundred ninety-four thousand, seven hundred sixty-three".