20764428 has 24 divisors (see below), whose sum is σ = 48882288. Its totient is φ = 6859776.

The previous prime is 20764427. The next prime is 20764487. The reversal of 20764428 is 82446702.

It is a super-2 number, since 2×20764428² = 862322940334368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20764421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6301 + ... + 9012.

It is an arithmetic number, because the mean of its divisors is an integer number (2036762).

Almost surely, 2^20764428 is an apocalyptic number.

It is an amenable number.

20764428 is an abundant number, since it is smaller than the sum of its proper divisors (28117860).

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

20764428 is a wasteful number, since it uses less digits than its factorization.

20764428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15433 (or 15431 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20764428 is about 4556.8001931180. The cubic root of 20764428 is about 274.8569084778.

The spelling of 20764428 in words is "twenty million, seven hundred sixty-four thousand, four hundred twenty-eight".