20209402 has 8 divisors (see below), whose sum is σ = 30412512. Its totient is φ = 10071900.

The previous prime is 20209381. The next prime is 20209429. The reversal of 20209402 is 20490202.

It is a happy number.

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 20209402.

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, 15624 + ... + 16867.

It is an arithmetic number, because the mean of its divisors is an integer number (3801564).

Almost surely, 2^20209402 is an apocalyptic number.

20209402 is a deficient number, since it is larger than the sum of its proper divisors (10203110).

20209402 is a wasteful number, since it uses less digits than its factorization.

20209402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32804.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20209402 is about 4495.4868479398. The cubic root of 20209402 is about 272.3858153031.

Adding to 20209402 its reverse (20490202), we get a palindrome (40699604).

The spelling of 20209402 in words is "twenty million, two hundred nine thousand, four hundred two".