20061870 has 64 divisors (see below), whose sum is σ = 51528960. Its totient is φ = 4981248.

The previous prime is 20061857. The next prime is 20061871. The reversal of 20061870 is 7816002.

It is a self number, because there is not a number n which added to its sum of digits gives 20061870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20061871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70749 + ... + 71031.

It is an arithmetic number, because the mean of its divisors is an integer number (805140).

Almost surely, 2^20061870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20061870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25764480).

20061870 is an abundant number, since it is smaller than the sum of its proper divisors (31467090).

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

20061870 is a wasteful number, since it uses less digits than its factorization.

20061870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20061870 is about 4479.0478898980. The cubic root of 20061870 is about 271.7213752258.

Adding to 20061870 its reverse (7816002), we get a palindrome (27877872).

The spelling of 20061870 in words is "twenty million, sixty-one thousand, eight hundred seventy".