20726478 has 12 divisors (see below), whose sum is σ = 44907408. Its totient is φ = 6908820.

The previous prime is 20726477. The next prime is 20726479. The reversal of 20726478 is 87462702.

20726478 is a `hidden beast` number, since 2 + 0 + 7 + 2 + 647 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20726477) and next prime (20726479).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575718 + ... + 575753.

It is an arithmetic number, because the mean of its divisors is an integer number (3742284).

Almost surely, 2^20726478 is an apocalyptic number.

20726478 is an abundant number, since it is smaller than the sum of its proper divisors (24180930).

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

20726478 is a wasteful number, since it uses less digits than its factorization.

20726478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151479 (or 1151476 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20726478 is about 4552.6341825365. The cubic root of 20726478 is about 274.6893594247.

The spelling of 20726478 in words is "twenty million, seven hundred twenty-six thousand, four hundred seventy-eight".