20421002 has 32 divisors (see below), whose sum is σ = 36470784. Its totient is φ = 8391600.

The previous prime is 20420999. The next prime is 20421013. The reversal of 20421002 is 20012402.

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 15 ways as a sum of consecutive naturals, for example, 91463 + ... + 91685.

It is an arithmetic number, because the mean of its divisors is an integer number (1139712).

Almost surely, 2^20421002 is an apocalyptic number.

20421002 is a deficient number, since it is larger than the sum of its proper divisors (16049782).

20421002 is a wasteful number, since it uses less digits than its factorization.

20421002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20421002 is about 4518.9602786482. The cubic root of 20421002 is about 273.3331770109. Note that the first 3 decimals are identical.

Adding to 20421002 its reverse (20012402), we get a palindrome (40433404).

The spelling of 20421002 in words is "twenty million, four hundred twenty-one thousand, two".