20345988 has 24 divisors (see below), whose sum is σ = 51126208. Its totient is φ = 6260256.

The previous prime is 20345987. The next prime is 20345993. The reversal of 20345988 is 88954302.

It is a happy number.

It is a super-2 number, since 2×20345988² = 827918455392288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20345987) 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 7 ways as a sum of consecutive naturals, for example, 65056 + ... + 65367.

Almost surely, 2^20345988 is an apocalyptic number.

It is an amenable number.

20345988 is an abundant number, since it is smaller than the sum of its proper divisors (30780220).

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

20345988 is a wasteful number, since it uses less digits than its factorization.

20345988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130443 (or 130441 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20345988 is about 4510.6527243848. The cubic root of 20345988 is about 272.9980812703.

The spelling of 20345988 in words is "twenty million, three hundred forty-five thousand, nine hundred eighty-eight".