20819493 has 24 divisors (see below), whose sum is σ = 31236608. Its totient is φ = 13351392.

The previous prime is 20819467. The next prime is 20819521. The reversal of 20819493 is 39491802.

It is not a de Polignac number, because 20819493 - 2⁶ = 20819429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20819413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33996 + ... + 34602.

Almost surely, 2^20819493 is an apocalyptic number.

It is an amenable number.

20819493 is a deficient number, since it is larger than the sum of its proper divisors (10417115).

20819493 is a wasteful number, since it uses less digits than its factorization.

20819493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20819493 is about 4562.8382614333. The cubic root of 20819493 is about 275.0996575445.

It can be divided in two parts, 20819 and 493, that added together give a palindrome (21312).

The spelling of 20819493 in words is "twenty million, eight hundred nineteen thousand, four hundred ninety-three".