20347808 has 48 divisors (see below), whose sum is σ = 44230536. Its totient is φ = 9154560.

The previous prime is 20347807. The next prime is 20347829. The reversal of 20347808 is 80874302.

It can be written as a sum of positive squares in 4 ways, for example, as 8596624 + 11751184 = 2932^2 + 3428^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (20347807) 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 7 ways as a sum of consecutive naturals, for example, 16460 + ... + 17652.

Almost surely, 2^20347808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20347808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22115268).

20347808 is an abundant number, since it is smaller than the sum of its proper divisors (23882728).

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

20347808 is a wasteful number, since it uses less digits than its factorization.

20347808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20347808 is about 4510.8544645111. The cubic root of 20347808 is about 273.0062211502.

The spelling of 20347808 in words is "twenty million, three hundred forty-seven thousand, eight hundred eight".