20221488 has 120 divisors (see below), whose sum is σ = 67162368. Its totient is φ = 5769792.

The previous prime is 20221469. The next prime is 20221489. The reversal of 20221488 is 88412202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20221489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26845 + ... + 27587.

Almost surely, 2^20221488 is an apocalyptic number.

20221488 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 20221488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33581184).

20221488 is an abundant number, since it is smaller than the sum of its proper divisors (46940880).

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

20221488 is an equidigital number, since it uses as much as digits as its factorization.

20221488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20221488 is about 4496.8308840783. The cubic root of 20221488 is about 272.4401035485.

The spelling of 20221488 in words is "twenty million, two hundred twenty-one thousand, four hundred eighty-eight".