20231428 has 48 divisors (see below), whose sum is σ = 45118080. Its totient is φ = 7727616.

The previous prime is 20231423. The next prime is 20231429. The reversal of 20231428 is 82413202.

It is a junction number, because it is equal to n+sod(n) for n = 20231399 and 20231408.

It is not an unprimeable number, because it can be changed into a prime (20231423) 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, 7926 + ... + 10162.

It is an arithmetic number, because the mean of its divisors is an integer number (939960).

Almost surely, 2^20231428 is an apocalyptic number.

20231428 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 20231428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22559040).

20231428 is an abundant number, since it is smaller than the sum of its proper divisors (24886652).

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

20231428 is a wasteful number, since it uses less digits than its factorization.

20231428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284 (or 2282 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20231428 is about 4497.9359710872. The cubic root of 20231428 is about 272.4847361200.

The spelling of 20231428 in words is "twenty million, two hundred thirty-one thousand, four hundred twenty-eight".