20621002 has 8 divisors (see below), whose sum is σ = 31047300. Its totient is φ = 10271904.

The previous prime is 20620997. The next prime is 20621009. The reversal of 20621002 is 20012602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19105641 + 1515361 = 4371^2 + 1231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20621009) 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 3 ways as a sum of consecutive naturals, for example, 18627 + ... + 19702.

Almost surely, 2^20621002 is an apocalyptic number.

20621002 is a deficient number, since it is larger than the sum of its proper divisors (10426298).

20621002 is a wasteful number, since it uses less digits than its factorization.

20621002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38600.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20621002 is about 4541.0353445002. The cubic root of 20621002 is about 274.2226066732. Note that the first 3 decimals are identical.

Adding to 20621002 its reverse (20012602), we get a palindrome (40633604).

Subtracting from 20621002 its reverse (20012602), we obtain a square (608400 = 780²).

The spelling of 20621002 in words is "twenty million, six hundred twenty-one thousand, two".