19620981 has 32 divisors (see below), whose sum is σ = 30096000. Its totient is φ = 12628224.

The previous prime is 19620947. The next prime is 19620983. The reversal of 19620981 is 18902691.

It is not a de Polignac number, because 19620981 - 2⁶ = 19620917 is a prime.

It is a super-2 number, since 2×19620981² = 769965790804722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19620983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173581 + ... + 173693.

It is an arithmetic number, because the mean of its divisors is an integer number (940500).

Almost surely, 2^19620981 is an apocalyptic number.

It is an amenable number.

19620981 is a deficient number, since it is larger than the sum of its proper divisors (10475019).

19620981 is a wasteful number, since it uses less digits than its factorization.

19620981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 19620981 is about 4429.5576528588. The cubic root of 19620981 is about 269.7161213871.

The spelling of 19620981 in words is "nineteen million, six hundred twenty thousand, nine hundred eighty-one".