20722427 has 4 divisors (see below), whose sum is σ = 22606296. Its totient is φ = 18838560.

The previous prime is 20722421. The next prime is 20722433. The reversal of 20722427 is 72422702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20722421) and next prime (20722433).

It is a cyclic number.

It is not a de Polignac number, because 20722427 - 2⁸ = 20722171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20722396 and 20722405.

It is not an unprimeable number, because it can be changed into a prime (20722421) 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, 941918 + ... + 941939.

It is an arithmetic number, because the mean of its divisors is an integer number (5651574).

Almost surely, 2^20722427 is an apocalyptic number.

20722427 is a deficient number, since it is larger than the sum of its proper divisors (1883869).

20722427 is a wasteful number, since it uses less digits than its factorization.

20722427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883868.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20722427 is about 4552.1892535351. The cubic root of 20722427 is about 274.6714622033.

The spelling of 20722427 in words is "twenty million, seven hundred twenty-two thousand, four hundred twenty-seven".