20021396 has 12 divisors (see below), whose sum is σ = 35101248. Its totient is φ = 9992472.

The previous prime is 20021387. The next prime is 20021399. The reversal of 20021396 is 69312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (2925104).

Almost surely, 2^20021396 is an apocalyptic number.

It is an amenable number.

20021396 is a deficient number, since it is larger than the sum of its proper divisors (15079852).

20021396 is a wasteful number, since it uses less digits than its factorization.

20021396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9118 (or 9116 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20021396 is about 4474.5274610846. The cubic root of 20021396 is about 271.5385232947.

Adding to 20021396 its reverse (69312002), we get a palindrome (89333398).

The spelling of 20021396 in words is "twenty million, twenty-one thousand, three hundred ninety-six".