20567428 has 48 divisors (see below), whose sum is σ = 43464960. Its totient is φ = 8325504.

The previous prime is 20567423. The next prime is 20567429. The reversal of 20567428 is 82476502.

It is a junction number, because it is equal to n+sod(n) for n = 20567393 and 20567402.

It is not an unprimeable number, because it can be changed into a prime (20567423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70050 + ... + 70342.

It is an arithmetic number, because the mean of its divisors is an integer number (905520).

Almost surely, 2^20567428 is an apocalyptic number.

20567428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20567428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21732480).

20567428 is an abundant number, since it is smaller than the sum of its proper divisors (22897532).

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

20567428 is a wasteful number, since it uses less digits than its factorization.

20567428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20567428 is about 4535.1326331211. The cubic root of 20567428 is about 273.9849211159.

The spelling of 20567428 in words is "twenty million, five hundred sixty-seven thousand, four hundred twenty-eight".