20493693 has 24 divisors (see below), whose sum is σ = 32550336. Its totient is φ = 12321600.

The previous prime is 20493679. The next prime is 20493719. The reversal of 20493693 is 39639402.

It is a happy number.

It is not a de Polignac number, because 20493693 - 2⁴ = 20493677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20493293) 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, 12808 + ... + 14318.

It is an arithmetic number, because the mean of its divisors is an integer number (1356264).

Almost surely, 2^20493693 is an apocalyptic number.

It is an amenable number.

20493693 is a deficient number, since it is larger than the sum of its proper divisors (12056643).

20493693 is a wasteful number, since it uses less digits than its factorization.

20493693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665 (or 1662 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 20493693 is about 4526.9960238551. The cubic root of 20493693 is about 273.6571136667.

Adding to 20493693 its sum of digits (36), we get a square (20493729 = 4527²).

The spelling of 20493693 in words is "twenty million, four hundred ninety-three thousand, six hundred ninety-three".