20747020 has 24 divisors (see below), whose sum is σ = 49793184. Its totient is φ = 7113216.

The previous prime is 20747011. The next prime is 20747053. The reversal of 20747020 is 2074702.

It is a junction number, because it is equal to n+sod(n) for n = 20746982 and 20747000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73957 + ... + 74236.

It is an arithmetic number, because the mean of its divisors is an integer number (2074716).

Almost surely, 2^20747020 is an apocalyptic number.

20747020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20747020 is an abundant number, since it is smaller than the sum of its proper divisors (29046164).

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

20747020 is a wasteful number, since it uses less digits than its factorization.

20747020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148209 (or 148207 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 20747020 is about 4554.8896803326. The cubic root of 20747020 is about 274.7800776146.

The spelling of 20747020 in words is "twenty million, seven hundred forty-seven thousand, twenty".