19802061 has 12 divisors (see below), whose sum is σ = 28966080. Its totient is φ = 13033800.

The previous prime is 19802033. The next prime is 19802071. The reversal of 19802061 is 16020891.

It is not a de Polignac number, because 19802061 - 2⁶ = 19801997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19802021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13215 + ... + 14636.

It is an arithmetic number, because the mean of its divisors is an integer number (2413840).

Almost surely, 2^19802061 is an apocalyptic number.

It is an amenable number.

19802061 is a deficient number, since it is larger than the sum of its proper divisors (9164019).

19802061 is a wasteful number, since it uses less digits than its factorization.

19802061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27936 (or 27933 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 19802061 is about 4449.9506738839. The cubic root of 19802061 is about 270.5433092812.

The spelling of 19802061 in words is "nineteen million, eight hundred two thousand, sixty-one".