20021070 has 64 divisors (see below), whose sum is σ = 52301376. Its totient is φ = 4884480.

The previous prime is 20021069. The next prime is 20021081. The reversal of 20021070 is 7012002.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18340 + ... + 19400.

It is an arithmetic number, because the mean of its divisors is an integer number (817209).

Almost surely, 2^20021070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26150688).

20021070 is an abundant number, since it is smaller than the sum of its proper divisors (32280306).

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

20021070 is a wasteful number, since it uses less digits than its factorization.

20021070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 20021070 is about 4474.4910325086. The cubic root of 20021070 is about 271.5370495040.

Adding to 20021070 its reverse (7012002), we get a palindrome (27033072).

The spelling of 20021070 in words is "twenty million, twenty-one thousand, seventy".