19916061 has 32 divisors (see below), whose sum is σ = 31021056. Its totient is φ = 11232000.

The previous prime is 19916053. The next prime is 19916087. The reversal of 19916061 is 16061991.

It is not a de Polignac number, because 19916061 - 2³ = 19916053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73356 + ... + 73626.

It is an arithmetic number, because the mean of its divisors is an integer number (969408).

Almost surely, 2^19916061 is an apocalyptic number.

19916061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19916061 is a deficient number, since it is larger than the sum of its proper divisors (11104995).

19916061 is a wasteful number, since it uses less digits than its factorization.

19916061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 19916061 is about 4462.7414220409. The cubic root of 19916061 is about 271.0614866634.

The spelling of 19916061 in words is "nineteen million, nine hundred sixteen thousand, sixty-one".