19923813 has 96 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 9704448.

The previous prime is 19923811. The next prime is 19923823. The reversal of 19923813 is 31832991.

It is not a de Polignac number, because 19923813 - 2¹ = 19923811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19923811) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 375895 + ... + 375947.

It is an arithmetic number, because the mean of its divisors is an integer number (412776).

Almost surely, 2^19923813 is an apocalyptic number.

19923813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19923813 is a deficient number, since it is larger than the sum of its proper divisors (19702683).

19923813 is a wasteful number, since it uses less digits than its factorization.

19923813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 93 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 19923813 is about 4463.6098619839. The cubic root of 19923813 is about 271.0966508469.

It can be divided in two parts, 19923 and 813, that added together give a 4-th power (20736 = 12⁴).

The spelling of 19923813 in words is "nineteen million, nine hundred twenty-three thousand, eight hundred thirteen".