20215402 has 8 divisors (see below), whose sum is σ = 30360096. Its totient is φ = 10095372.

The previous prime is 20215381. The next prime is 20215417. The reversal of 20215402 is 20451202.

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

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 3 ways as a sum of consecutive naturals, for example, 3958 + ... + 7489.

It is an arithmetic number, because the mean of its divisors is an integer number (3795012).

Almost surely, 2^20215402 is an apocalyptic number.

20215402 is a deficient number, since it is larger than the sum of its proper divisors (10144694).

20215402 is a wasteful number, since it uses less digits than its factorization.

20215402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12332.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20215402 is about 4496.1541343686. The cubic root of 20215402 is about 272.4127689817.

Adding to 20215402 its reverse (20451202), we get a palindrome (40666604).

The spelling of 20215402 in words is "twenty million, two hundred fifteen thousand, four hundred two".