20034720 has 72 divisors (see below), whose sum is σ = 68373396. Its totient is φ = 5342208.

The previous prime is 20034719. The next prime is 20034727. The reversal of 20034720 is 2743002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20034576 + 144 = 4476^2 + 12^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20034693 and 20034702.

It is not an unprimeable number, because it can be changed into a prime (20034727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5517 + ... + 8396.

Almost surely, 2^20034720 is an apocalyptic number.

20034720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20034720 is an abundant number, since it is smaller than the sum of its proper divisors (48338676).

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

20034720 is a wasteful number, since it uses less digits than its factorization.

20034720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13934 (or 13923 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20034720 is about 4476.0160857620. The cubic root of 20034720 is about 271.5987451528.

Adding to 20034720 its reverse (2743002), we get a palindrome (22777722).

The spelling of 20034720 in words is "twenty million, thirty-four thousand, seven hundred twenty".