16861020 has 96 divisors (see below), whose sum is σ = 52496640. Its totient is φ = 4008960.

The previous prime is 16861003. The next prime is 16861021. The reversal of 16861020 is 2016861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861021) 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, 38724 + ... + 39156.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^16861020 is an apocalyptic number.

16861020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16861020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26248320).

16861020 is an abundant number, since it is smaller than the sum of its proper divisors (35635620).

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

16861020 is a wasteful number, since it uses less digits than its factorization.

16861020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 16861020 is about 4106.2172373122. The cubic root of 16861020 is about 256.4255414290.

Adding to 16861020 its reverse (2016861), we get a palindrome (18877881).

The spelling of 16861020 in words is "sixteen million, eight hundred sixty-one thousand, twenty".