20397726 has 24 divisors (see below), whose sum is σ = 44365464. Its totient is φ = 6773040.

The previous prime is 20397719. The next prime is 20397737. The reversal of 20397726 is 62779302.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2941 + ... + 7031.

It is an arithmetic number, because the mean of its divisors is an integer number (1848561).

Almost surely, 2^20397726 is an apocalyptic number.

20397726 is an abundant number, since it is smaller than the sum of its proper divisors (23967738).

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

20397726 is a wasteful number, since it uses less digits than its factorization.

20397726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376 (or 4373 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 20397726 is about 4516.3841732076. The cubic root of 20397726 is about 273.2292885118.

The spelling of 20397726 in words is "twenty million, three hundred ninety-seven thousand, seven hundred twenty-six".