19736981 has 4 divisors (see below), whose sum is σ = 21531264. Its totient is φ = 17942700.

The previous prime is 19736939. The next prime is 19736989. The reversal of 19736981 is 18963791.

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.

It is a cyclic number.

It is not a de Polignac number, because 19736981 - 2¹⁰ = 19735957 is a prime.

It is a super-2 number, since 2×19736981² = 779096837988722, 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 (19736989) 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, 897125 + ... + 897146.

It is an arithmetic number, because the mean of its divisors is an integer number (5382816).

Almost surely, 2^19736981 is an apocalyptic number.

19736981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19736981 is a deficient number, since it is larger than the sum of its proper divisors (1794283).

19736981 is a wasteful number, since it uses less digits than its factorization.

19736981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794282.

The product of its digits is 81648, while the sum is 44.

The square root of 19736981 is about 4442.6322152526. The cubic root of 19736981 is about 270.2466014041.

The spelling of 19736981 in words is "nineteen million, seven hundred thirty-six thousand, nine hundred eighty-one".