20726540 has 12 divisors (see below), whose sum is σ = 43525776. Its totient is φ = 8290608.

The previous prime is 20726539. The next prime is 20726543. The reversal of 20726540 is 4562702.

It is not an unprimeable number, because it can be changed into a prime (20726543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518144 + ... + 518183.

It is an arithmetic number, because the mean of its divisors is an integer number (3627148).

Almost surely, 2^20726540 is an apocalyptic number.

20726540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20726540 is an abundant number, since it is smaller than the sum of its proper divisors (22799236).

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

20726540 is a wasteful number, since it uses less digits than its factorization.

20726540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036336 (or 1036334 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20726540 is about 4552.6409917761. The cubic root of 20726540 is about 274.6896333211.

The spelling of 20726540 in words is "twenty million, seven hundred twenty-six thousand, five hundred forty".