20204402 has 4 divisors (see below), whose sum is σ = 30306606. Its totient is φ = 10102200.

The previous prime is 20204389. The next prime is 20204411. The reversal of 20204402 is 20440202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20440202 = 2 ⋅10220101.

It can be written as a sum of positive squares in only one way, i.e., 19280881 + 923521 = 4391^2 + 961^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051099 + ... + 5051102.

Almost surely, 2^20204402 is an apocalyptic number.

20204402 is a deficient number, since it is larger than the sum of its proper divisors (10102204).

20204402 is a wasteful number, since it uses less digits than its factorization.

20204402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10102203.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20204402 is about 4494.9307002444. The cubic root of 20204402 is about 272.3633498287.

Adding to 20204402 its reverse (20440202), we get a palindrome (40644604).

The spelling of 20204402 in words is "twenty million, two hundred four thousand, four hundred two".