19942681 has 16 divisors (see below), whose sum is σ = 22498560. Its totient is φ = 17521920.

The previous prime is 19942673. The next prime is 19942709. The reversal of 19942681 is 18624991.

It is a cyclic number.

It is not a de Polignac number, because 19942681 - 2³ = 19942673 is a prime.

It is a super-2 number, since 2×19942681² = 795421050935522, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (31104) is a multiple of the sum of its prime divisors (576).

It is not an unprimeable number, because it can be changed into a prime (19942621) 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, 45841 + ... + 46273.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^19942681 is an apocalyptic number.

19942681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19942681 is a deficient number, since it is larger than the sum of its proper divisors (2555879).

19942681 is a wasteful number, since it uses less digits than its factorization.

19942681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 31104, while the sum is 40.

The square root of 19942681 is about 4465.7228978073. The cubic root of 19942681 is about 271.1822006995.

The spelling of 19942681 in words is "nineteen million, nine hundred forty-two thousand, six hundred eighty-one".