20016690 has 32 divisors (see below), whose sum is σ = 50569920. Its totient is φ = 5056704.

The previous prime is 20016679. The next prime is 20016691. The reversal of 20016690 is 9661002.

It is a super-2 number, since 2×20016690² = 801335757112200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20016690.

It is not an unprimeable number, because it can be changed into a prime (20016691) 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, 16989 + ... + 18128.

It is an arithmetic number, because the mean of its divisors is an integer number (1580310).

Almost surely, 2^20016690 is an apocalyptic number.

20016690 is an abundant number, since it is smaller than the sum of its proper divisors (30553230).

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

20016690 is a wasteful number, since it uses less digits than its factorization.

20016690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35146.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20016690 is about 4474.0015645952. The cubic root of 20016690 is about 271.5172467160.

Adding to 20016690 its reverse (9661002), we get a palindrome (29677692).

It can be divided in two parts, 20016 and 690, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20016690 in words is "twenty million, sixteen thousand, six hundred ninety".