20726740 has 24 divisors (see below), whose sum is σ = 46087272. Its totient is φ = 7802880.

The previous prime is 20726737. The next prime is 20726743. The reversal of 20726740 is 4762702.

It is an interprime number because it is at equal distance from previous prime (20726737) and next prime (20726743).

It can be written as a sum of positive squares in 4 ways, for example, as 242064 + 20484676 = 492^2 + 4526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20726699 and 20726708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30141 + ... + 30820.

It is an arithmetic number, because the mean of its divisors is an integer number (1920303).

Almost surely, 2^20726740 is an apocalyptic number.

20726740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20726740 is an abundant number, since it is smaller than the sum of its proper divisors (25360532).

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

20726740 is a wasteful number, since it uses less digits than its factorization.

20726740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60987 (or 60985 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20726740 is about 4552.6629569956. The cubic root of 20726740 is about 274.6905168542.

The spelling of 20726740 in words is "twenty million, seven hundred twenty-six thousand, seven hundred forty".