20291488 has 36 divisors (see below), whose sum is σ = 46474722. Its totient is φ = 8695680.

The previous prime is 20291483. The next prime is 20291501. The reversal of 20291488 is 88419202.

It can be written as a sum of positive squares in only one way, i.e., 15147664 + 5143824 = 3892^2 + 2268^2 .

It is not an unprimeable number, because it can be changed into a prime (20291483) 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 5 ways as a sum of consecutive naturals, for example, 4903 + ... + 8038.

Almost surely, 2^20291488 is an apocalyptic number.

20291488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20291488 is an abundant number, since it is smaller than the sum of its proper divisors (26183234).

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

20291488 is a wasteful number, since it uses less digits than its factorization.

20291488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12965 (or 12950 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 20291488 is about 4504.6074190766. The cubic root of 20291488 is about 272.7541068815.

The spelling of 20291488 in words is "twenty million, two hundred ninety-one thousand, four hundred eighty-eight".