20973403 has 4 divisors (see below), whose sum is σ = 22880088. Its totient is φ = 19066720.

The previous prime is 20973383. The next prime is 20973431. The reversal of 20973403 is 30437902.

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 20973403 - 2⁵ = 20973371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20973443) 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, 953326 + ... + 953347.

It is an arithmetic number, because the mean of its divisors is an integer number (5720022).

Almost surely, 2^20973403 is an apocalyptic number.

20973403 is a deficient number, since it is larger than the sum of its proper divisors (1906685).

20973403 is a wasteful number, since it uses less digits than its factorization.

20973403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906684.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20973403 is about 4579.6728049065. The cubic root of 20973403 is about 275.7758936589.

The spelling of 20973403 in words is "twenty million, nine hundred seventy-three thousand, four hundred three".