20404402 has 8 divisors (see below), whose sum is σ = 30678912. Its totient is φ = 10178100.

The previous prime is 20404393. The next prime is 20404411. The reversal of 20404402 is 20440402.

It is an interprime number because it is at equal distance from previous prime (20404393) and next prime (20404411).

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, 10974 + ... + 12697.

It is an arithmetic number, because the mean of its divisors is an integer number (3834864).

Almost surely, 2^20404402 is an apocalyptic number.

20404402 is a deficient number, since it is larger than the sum of its proper divisors (10274510).

20404402 is a wasteful number, since it uses less digits than its factorization.

20404402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24104.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20404402 is about 4517.1231995596. The cubic root of 20404402 is about 273.2590937911.

Adding to 20404402 its reverse (20440402), we get a palindrome (40844804).

The spelling of 20404402 in words is "twenty million, four hundred four thousand, four hundred two".