20727138 has 32 divisors (see below), whose sum is σ = 44049600. Its totient is φ = 6483456.

The previous prime is 20727137. The next prime is 20727167. The reversal of 20727138 is 83172702.

It is a super-2 number, since 2×20727138² = 859228499342088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20727137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12078 + ... + 13686.

It is an arithmetic number, because the mean of its divisors is an integer number (1376550).

Almost surely, 2^20727138 is an apocalyptic number.

20727138 is an abundant number, since it is smaller than the sum of its proper divisors (23322462).

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

20727138 is a wasteful number, since it uses less digits than its factorization.

20727138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20727138 is about 4552.7066674672. The cubic root of 20727138 is about 274.6922750681.

The spelling of 20727138 in words is "twenty million, seven hundred twenty-seven thousand, one hundred thirty-eight".