20922001 has 4 divisors (see below), whose sum is σ = 20965104. Its totient is φ = 20878900.

The previous prime is 20921987. The next prime is 20922017. The reversal of 20922001 is 10022902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10022902 = 2 ⋅5011451.

It is a cyclic number.

It is not a de Polignac number, because 20922001 - 2¹¹ = 20919953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20922061) 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, 20815 + ... + 21796.

It is an arithmetic number, because the mean of its divisors is an integer number (5241276).

Almost surely, 2^20922001 is an apocalyptic number.

It is an amenable number.

20922001 is a deficient number, since it is larger than the sum of its proper divisors (43103).

20922001 is an equidigital number, since it uses as much as digits as its factorization.

20922001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43102.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20922001 is about 4574.0573892333. The cubic root of 20922001 is about 275.5504171550.

Adding to 20922001 its reverse (10022902), we get a palindrome (30944903).

The spelling of 20922001 in words is "twenty million, nine hundred twenty-two thousand, one".