20389953 has 16 divisors (see below), whose sum is σ = 28964736. Its totient is φ = 12714240.

The previous prime is 20389951. The next prime is 20389991. The reversal of 20389953 is 35998302.

It is not a de Polignac number, because 20389953 - 2¹ = 20389951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20389951) 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, 7668 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (1810296).

Almost surely, 2^20389953 is an apocalyptic number.

It is an amenable number.

20389953 is a deficient number, since it is larger than the sum of its proper divisors (8574783).

20389953 is a wasteful number, since it uses less digits than its factorization.

20389953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 20389953 is about 4515.5235576841. The cubic root of 20389953 is about 273.1945774351.

The spelling of 20389953 in words is "twenty million, three hundred eighty-nine thousand, nine hundred fifty-three".