19902016 has 14 divisors (see below), whose sum is σ = 39493190. Its totient is φ = 9950976.

The previous prime is 19902013. The next prime is 19902017. The reversal of 19902016 is 61020991.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 2262016 = 4200^2 + 1504^2 .

It is a super-3 number, since 3×19902016³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19902011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155421 + ... + 155548.

Almost surely, 2^19902016 is an apocalyptic number.

19902016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19902016 is a deficient number, since it is larger than the sum of its proper divisors (19591174).

19902016 is an equidigital number, since it uses as much as digits as its factorization.

19902016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310981 (or 310971 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 19902016 is about 4461.1675601797. The cubic root of 19902016 is about 270.9977532799.

The spelling of 19902016 in words is "nineteen million, nine hundred two thousand, sixteen".