20674820 has 12 divisors (see below), whose sum is σ = 43417164. Its totient is φ = 8269920.

The previous prime is 20674817. The next prime is 20674837. The reversal of 20674820 is 2847602.

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 6895876 = 3712^2 + 2626^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516851 + ... + 516890.

It is an arithmetic number, because the mean of its divisors is an integer number (3618097).

Almost surely, 2^20674820 is an apocalyptic number.

20674820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20674820 is an abundant number, since it is smaller than the sum of its proper divisors (22742344).

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

20674820 is a wasteful number, since it uses less digits than its factorization.

20674820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033750 (or 1033748 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20674820 is about 4546.9572243425. The cubic root of 20674820 is about 274.4609606249.

The spelling of 20674820 in words is "twenty million, six hundred seventy-four thousand, eight hundred twenty".