20820284 has 6 divisors (see below), whose sum is σ = 36435504. Its totient is φ = 10410140.

The previous prime is 20820259. The next prime is 20820311. The reversal of 20820284 is 48202802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602532 + ... + 2602539.

It is an arithmetic number, because the mean of its divisors is an integer number (6072584).

Almost surely, 2^20820284 is an apocalyptic number.

It is an amenable number.

20820284 is a deficient number, since it is larger than the sum of its proper divisors (15615220).

20820284 is a wasteful number, since it uses less digits than its factorization.

20820284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205075 (or 5205073 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20820284 is about 4562.9249391153. The cubic root of 20820284 is about 275.1031414762.

The spelling of 20820284 in words is "twenty million, eight hundred twenty thousand, two hundred eighty-four".