20553428 has 24 divisors (see below), whose sum is σ = 41224512. Its totient is φ = 8783424.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553428 is 82435502.

It is a self number, because there is not a number n which added to its sum of digits gives 20553428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11576 + ... + 13232.

It is an arithmetic number, because the mean of its divisors is an integer number (1717688).

Almost surely, 2^20553428 is an apocalyptic number.

20553428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20553428 is an abundant number, since it is smaller than the sum of its proper divisors (20671084).

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

20553428 is a wasteful number, since it uses less digits than its factorization.

20553428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 20553428 is about 4533.5888653472. The cubic root of 20553428 is about 273.9227409291.

The spelling of 20553428 in words is "twenty million, five hundred fifty-three thousand, four hundred twenty-eight".