20070720 has 224 divisors, whose sum is σ = 74615040. Its totient is φ = 5068800.

The previous prime is 20070719. The next prime is 20070737. The reversal of 20070720 is 2707002.

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 = 20070693 and 20070702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198670 + ... + 198770.

Almost surely, 2^20070720 is an apocalyptic number.

20070720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20070720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37307520).

20070720 is an abundant number, since it is smaller than the sum of its proper divisors (54544320).

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

20070720 is a wasteful number, since it uses less digits than its factorization.

20070720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 18.

The square root of 20070720 is about 4480.0357141434. The cubic root of 20070720 is about 271.7613246531.

Adding to 20070720 its reverse (2707002), we get a palindrome (22777722).

The spelling of 20070720 in words is "twenty million, seventy thousand, seven hundred twenty".