20720726 has 8 divisors (see below), whose sum is σ = 33471984. Its totient is φ = 9563400.

The previous prime is 20720719. The next prime is 20720731. The reversal of 20720726 is 62702702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 796951 = 20720726 / (2 + 0 + 7 + 2 + 0 + 7 + 2 + 6).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20720695 and 20720704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398450 + ... + 398501.

It is an arithmetic number, because the mean of its divisors is an integer number (4183998).

Almost surely, 2^20720726 is an apocalyptic number.

20720726 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20720726 is a deficient number, since it is larger than the sum of its proper divisors (12751258).

20720726 is a wasteful number, since it uses less digits than its factorization.

20720726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796966.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20720726 is about 4552.0024165196. The cubic root of 20720726 is about 274.6639465305.

The spelling of 20720726 in words is "twenty million, seven hundred twenty thousand, seven hundred twenty-six".