20021404 has 12 divisors (see below), whose sum is σ = 37732744. Its totient is φ = 9240624.

The previous prime is 20021399. The next prime is 20021411. The reversal of 20021404 is 40412002.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

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, 192462 + ... + 192565.

Almost surely, 2^20021404 is an apocalyptic number.

It is an amenable number.

20021404 is a deficient number, since it is larger than the sum of its proper divisors (17711340).

20021404 is a wasteful number, since it uses less digits than its factorization.

20021404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385044 (or 385042 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20021404 is about 4474.5283550336. The cubic root of 20021404 is about 271.5385594611.

Adding to 20021404 its reverse (40412002), we get a palindrome (60433406).

The spelling of 20021404 in words is "twenty million, twenty-one thousand, four hundred four".