20734820 has 24 divisors (see below), whose sum is σ = 43659000. Its totient is φ = 8271872.

The previous prime is 20734801. The next prime is 20734829. The reversal of 20734820 is 2843702.

It can be written as a sum of positive squares in 4 ways, for example, as 5866084 + 14868736 = 2422^2 + 3856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20734820.

It is not an unprimeable number, because it can be changed into a prime (20734829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7826 + ... + 10134.

It is an arithmetic number, because the mean of its divisors is an integer number (1819125).

Almost surely, 2^20734820 is an apocalyptic number.

20734820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20734820 is an abundant number, since it is smaller than the sum of its proper divisors (22924180).

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

20734820 is a wasteful number, since it uses less digits than its factorization.

20734820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20734820 is about 4553.5502632561. The cubic root of 20734820 is about 274.7262068377.

The spelling of 20734820 in words is "twenty million, seven hundred thirty-four thousand, eight hundred twenty".