19996761 has 16 divisors (see below), whose sum is σ = 27972864. Its totient is φ = 12691584.

The previous prime is 19996751. The next prime is 19996771. The reversal of 19996761 is 16769991.

It is an interprime number because it is at equal distance from previous prime (19996751) and next prime (19996771).

It is a de Polignac number, because none of the positive numbers 2^k-19996761 is a prime.

It is a super-2 number, since 2×19996761² = 799740900982242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19996761.

It is not an unprimeable number, because it can be changed into a prime (19996751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3301 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1748304).

Almost surely, 2^19996761 is an apocalyptic number.

It is an amenable number.

19996761 is a deficient number, since it is larger than the sum of its proper divisors (7976103).

19996761 is a wasteful number, since it uses less digits than its factorization.

19996761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920.

The product of its digits is 183708, while the sum is 48.

The square root of 19996761 is about 4471.7738091276. The cubic root of 19996761 is about 271.4271075373.

It can be divided in two parts, 199967 and 61, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 19996761 in words is "nineteen million, nine hundred ninety-six thousand, seven hundred sixty-one".