20498988 has 18 divisors (see below), whose sum is σ = 47867596. Its totient is φ = 6827768.

The previous prime is 20498983. The next prime is 20498993. The reversal of 20498988 is 88989402.

It is an interprime number because it is at equal distance from previous prime (20498983) and next prime (20498993).

It is not an unprimeable number, because it can be changed into a prime (20498981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15031 + ... + 16337.

Almost surely, 2^20498988 is an apocalyptic number.

It is an amenable number.

20498988 is an abundant number, since it is smaller than the sum of its proper divisors (27368608).

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

20498988 is an equidigital number, since it uses as much as digits as its factorization.

20498988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 20498988 is about 4527.5808109850. The cubic root of 20498988 is about 273.6806800982.

Multiplying 20498988 by its sum of digits (48), we get a square (983951424 = 31368²).

The spelling of 20498988 in words is "twenty million, four hundred ninety-eight thousand, nine hundred eighty-eight".