20021010 has 16 divisors (see below), whose sum is σ = 48050496. Its totient is φ = 5338928.

The previous prime is 20020943. The next prime is 20021021. The reversal of 20021010 is 1012002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a self number, because there is not a number n which added to its sum of digits gives 20021010.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 333654 + ... + 333713.

It is an arithmetic number, because the mean of its divisors is an integer number (3003156).

Almost surely, 2^20021010 is an apocalyptic number.

20021010 is an abundant number, since it is smaller than the sum of its proper divisors (28029486).

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

20021010 is a wasteful number, since it uses less digits than its factorization.

20021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667377.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20021010 is about 4474.4843278304. The cubic root of 20021010 is about 271.5367782525.

Adding to 20021010 its reverse (1012002), we get a palindrome (21033012).

The spelling of 20021010 in words is "twenty million, twenty-one thousand, ten".