20218953 has 8 divisors (see below), whose sum is σ = 27030528. Its totient is φ = 13443344.

The previous prime is 20218949. The next prime is 20218969. The reversal of 20218953 is 35981202.

It is a happy number.

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 20218953 - 2² = 20218949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20218953.

It is not an unprimeable number, because it can be changed into a prime (20218903) 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, 7650 + ... + 9947.

It is an arithmetic number, because the mean of its divisors is an integer number (3378816).

Almost surely, 2^20218953 is an apocalyptic number.

It is an amenable number.

20218953 is a deficient number, since it is larger than the sum of its proper divisors (6811575).

20218953 is a wasteful number, since it uses less digits than its factorization.

20218953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17983.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20218953 is about 4496.5490100743. The cubic root of 20218953 is about 272.4287185550.

The spelling of 20218953 in words is "twenty million, two hundred eighteen thousand, nine hundred fifty-three".