20954321 has 16 divisors (see below), whose sum is σ = 23237760. Its totient is φ = 18817920.

The previous prime is 20954303. The next prime is 20954333. The reversal of 20954321 is 12345902.

It is a cyclic number.

It is not a de Polignac number, because 20954321 - 2⁶ = 20954257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20954341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28460 + ... + 29186.

It is an arithmetic number, because the mean of its divisors is an integer number (1452360).

Almost surely, 2^20954321 is an apocalyptic number.

It is an amenable number.

20954321 is a deficient number, since it is larger than the sum of its proper divisors (2283439).

20954321 is a wasteful number, since it uses less digits than its factorization.

20954321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20954321 is about 4577.5889942196. The cubic root of 20954321 is about 275.6922329015.

The spelling of 20954321 in words is "twenty million, nine hundred fifty-four thousand, three hundred twenty-one".