19956493 has 4 divisors (see below), whose sum is σ = 20046208. Its totient is φ = 19866780.

The previous prime is 19956491. The next prime is 19956499. The reversal of 19956493 is 39465991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39465991 = 193 ⋅204487.

It is a cyclic number.

It is not a de Polignac number, because 19956493 - 2¹ = 19956491 is a prime.

It is a super-2 number, since 2×19956493² = 796523225718098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956491) 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, 44523 + ... + 44968.

It is an arithmetic number, because the mean of its divisors is an integer number (5011552).

Almost surely, 2^19956493 is an apocalyptic number.

It is an amenable number.

19956493 is a deficient number, since it is larger than the sum of its proper divisors (89715).

19956493 is an equidigital number, since it uses as much as digits as its factorization.

19956493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89714.

The product of its digits is 262440, while the sum is 46.

The square root of 19956493 is about 4467.2690762926. The cubic root of 19956493 is about 271.2447918188.

It can be divided in two parts, 19956 and 493, that added together give a square (20449 = 143²).

The spelling of 19956493 in words is "nineteen million, nine hundred fifty-six thousand, four hundred ninety-three".