20712198 has 16 divisors (see below), whose sum is σ = 44611056. Its totient is φ = 6372960.

The previous prime is 20712187. The next prime is 20712199. The reversal of 20712198 is 89121702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712199) 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, 132693 + ... + 132848.

It is an arithmetic number, because the mean of its divisors is an integer number (2788191).

Almost surely, 2^20712198 is an apocalyptic number.

20712198 is an abundant number, since it is smaller than the sum of its proper divisors (23898858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20712198 is a wasteful number, since it uses less digits than its factorization.

20712198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265559.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20712198 is about 4551.0655895076. The cubic root of 20712198 is about 274.6262603421.

It can be divided in two parts, 20712 and 198, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20712198 in words is "twenty million, seven hundred twelve thousand, one hundred ninety-eight".