20911198 has 16 divisors (see below), whose sum is σ = 39106944. Its totient is φ = 8147160.

The previous prime is 20911183. The next prime is 20911211. The reversal of 20911198 is 89111902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67740 + ... + 68047.

It is an arithmetic number, because the mean of its divisors is an integer number (2444184).

Almost surely, 2^20911198 is an apocalyptic number.

20911198 is a deficient number, since it is larger than the sum of its proper divisors (18195746).

20911198 is a wasteful number, since it uses less digits than its factorization.

20911198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135807.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 20911198 is about 4572.8763377113. The cubic root of 20911198 is about 275.5029825007.

The spelling of 20911198 in words is "twenty million, nine hundred eleven thousand, one hundred ninety-eight".