20218402 has 8 divisors (see below), whose sum is σ = 30347856. Its totient is φ = 10102452.

The previous prime is 20218381. The next prime is 20218411. The reversal of 20218402 is 20481202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20218402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2233 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (3793482).

Almost surely, 2^20218402 is an apocalyptic number.

20218402 is a deficient number, since it is larger than the sum of its proper divisors (10129454).

20218402 is a wasteful number, since it uses less digits than its factorization.

20218402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20218402 is about 4496.4877404481. The cubic root of 20218402 is about 272.4262438211.

Adding to 20218402 its reverse (20481202), we get a palindrome (40699604).

The spelling of 20218402 in words is "twenty million, two hundred eighteen thousand, four hundred two".