20930493 has 8 divisors (see below), whose sum is σ = 28661728. Its totient is φ = 13576464.

The previous prime is 20930471. The next prime is 20930501. The reversal of 20930493 is 39403902.

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

It is not a de Polignac number, because 20930493 - 2⁵ = 20930461 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 20930493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20930423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94171 + ... + 94392.

It is an arithmetic number, because the mean of its divisors is an integer number (3582716).

Almost surely, 2^20930493 is an apocalyptic number.

It is an amenable number.

20930493 is a deficient number, since it is larger than the sum of its proper divisors (7731235).

20930493 is a wasteful number, since it uses less digits than its factorization.

20930493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188603.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 20930493 is about 4574.9855737477. The cubic root of 20930493 is about 275.5876930291.

The spelling of 20930493 in words is "twenty million, nine hundred thirty thousand, four hundred ninety-three".