20820412 has 6 divisors (see below), whose sum is σ = 36435728. Its totient is φ = 10410204.

The previous prime is 20820407. The next prime is 20820413. The reversal of 20820412 is 21402802.

It is a self number, because there is not a number n which added to its sum of digits gives 20820412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602548 + ... + 2602555.

Almost surely, 2^20820412 is an apocalyptic number.

It is an amenable number.

20820412 is a deficient number, since it is larger than the sum of its proper divisors (15615316).

20820412 is a wasteful number, since it uses less digits than its factorization.

20820412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205107 (or 5205105 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20820412 is about 4562.9389651846. The cubic root of 20820412 is about 275.1037052394.

The spelling of 20820412 in words is "twenty million, eight hundred twenty thousand, four hundred twelve".