20951018 has 16 divisors (see below), whose sum is σ = 34866720. Its totient is φ = 9361200.

The previous prime is 20951017. The next prime is 20951023. The reversal of 20951018 is 81015902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20951011) 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, 6773 + ... + 9368.

It is an arithmetic number, because the mean of its divisors is an integer number (2179170).

Almost surely, 2^20951018 is an apocalyptic number.

20951018 is a deficient number, since it is larger than the sum of its proper divisors (13915702).

20951018 is a wasteful number, since it uses less digits than its factorization.

20951018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16213.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20951018 is about 4577.2282005598. The cubic root of 20951018 is about 275.6777464813.

It can be divided in two parts, 2095 and 1018, that added together give a palindrome (3113).

The spelling of 20951018 in words is "twenty million, nine hundred fifty-one thousand, eighteen".