20936820 has 48 divisors (see below), whose sum is σ = 60213888. Its totient is φ = 5431680.

The previous prime is 20936819. The next prime is 20936821. The reversal of 20936820 is 2863902.

It is an interprime number because it is at equal distance from previous prime (20936819) and next prime (20936821).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (1254456).

Almost surely, 2^20936820 is an apocalyptic number.

20936820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20936820 is an abundant number, since it is smaller than the sum of its proper divisors (39277068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20936820 is a wasteful number, since it uses less digits than its factorization.

20936820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480 (or 9478 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20936820 is about 4575.6769990899. The cubic root of 20936820 is about 275.6154590205.

The spelling of 20936820 in words is "twenty million, nine hundred thirty-six thousand, eight hundred twenty".