20993726 has 32 divisors (see below), whose sum is σ = 35303520. Its totient is φ = 9300096.

The previous prime is 20993719. The next prime is 20993741. The reversal of 20993726 is 62739902.

It is a self number, because there is not a number n which added to its sum of digits gives 20993726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133640 + ... + 133796.

It is an arithmetic number, because the mean of its divisors is an integer number (1103235).

Almost surely, 2^20993726 is an apocalyptic number.

20993726 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20993726 is a deficient number, since it is larger than the sum of its proper divisors (14309794).

20993726 is a wasteful number, since it uses less digits than its factorization.

20993726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20993726 is about 4581.8910942972. The cubic root of 20993726 is about 275.8649395201.

The spelling of 20993726 in words is "twenty million, nine hundred ninety-three thousand, seven hundred twenty-six".