20743828 has 24 divisors (see below), whose sum is σ = 42611072. Its totient is φ = 8649504.

The previous prime is 20743819. The next prime is 20743831. The reversal of 20743828 is 82834702.

It is a junction number, because it is equal to n+sod(n) for n = 20743793 and 20743802.

It is a congruent number.

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, 8976 + ... + 11047.

Almost surely, 2^20743828 is an apocalyptic number.

20743828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20743828 is an abundant number, since it is smaller than the sum of its proper divisors (21867244).

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

20743828 is a wasteful number, since it uses less digits than its factorization.

20743828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20071 (or 20069 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 20743828 is about 4554.5392741747. The cubic root of 20743828 is about 274.7659849402.

The spelling of 20743828 in words is "twenty million, seven hundred forty-three thousand, eight hundred twenty-eight".