19770018 has 16 divisors (see below), whose sum is σ = 41259456. Its totient is φ = 6303440.

The previous prime is 19770017. The next prime is 19770029. The reversal of 19770018 is 81007791.

It is a super-2 number, since 2×19770018² = 781707223440648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19770017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71493 + ... + 71768.

It is an arithmetic number, because the mean of its divisors is an integer number (2578716).

Almost surely, 2^19770018 is an apocalyptic number.

19770018 is an abundant number, since it is smaller than the sum of its proper divisors (21489438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19770018 is a wasteful number, since it uses less digits than its factorization.

19770018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143289.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 19770018 is about 4446.3488392163. The cubic root of 19770018 is about 270.3973026031.

The spelling of 19770018 in words is "nineteen million, seven hundred seventy thousand, eighteen".