20262721 has 8 divisors (see below), whose sum is σ = 21542400. Its totient is φ = 19004400.

The previous prime is 20262713. The next prime is 20262727. The reversal of 20262721 is 12726202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20262721 - 2³ = 20262713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20262692 and 20262701.

It is not an unprimeable number, because it can be changed into a prime (20262727) 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, 3361 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (2692800).

Almost surely, 2^20262721 is an apocalyptic number.

It is an amenable number.

20262721 is a deficient number, since it is larger than the sum of its proper divisors (1279679).

20262721 is a wasteful number, since it uses less digits than its factorization.

20262721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10679.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20262721 is about 4501.4132225336. The cubic root of 20262721 is about 272.6251525109.

Adding to 20262721 its reverse (12726202), we get a palindrome (32988923).

The spelling of 20262721 in words is "twenty million, two hundred sixty-two thousand, seven hundred twenty-one".