20955970 has 16 divisors (see below), whose sum is σ = 43109568. Its totient is φ = 7184880.

The previous prime is 20955953. The next prime is 20955971. The reversal of 20955970 is 7955902.

It is not an unprimeable number, because it can be changed into a prime (20955971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149616 + ... + 149755.

It is an arithmetic number, because the mean of its divisors is an integer number (2694348).

Almost surely, 2^20955970 is an apocalyptic number.

20955970 is an abundant number, since it is smaller than the sum of its proper divisors (22153598).

20955970 is a wasteful number, since it uses less digits than its factorization.

20955970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299385.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 20955970 is about 4577.7691073273. The cubic root of 20955970 is about 275.6994645772.

The spelling of 20955970 in words is "twenty million, nine hundred fifty-five thousand, nine hundred seventy".