20138311 has 2 divisors, whose sum is σ = 20138312. Its totient is φ = 20138310.

The previous prime is 20138303. The next prime is 20138329. The reversal of 20138311 is 11383102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20138311 - 2³ = 20138303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20138351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069155 + 10069156.

It is an arithmetic number, because the mean of its divisors is an integer number (10069156).

Almost surely, 2^20138311 is an apocalyptic number.

20138311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138311 is an equidigital number, since it uses as much as digits as its factorization.

20138311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20138311 is about 4487.5729520533. The cubic root of 20138311 is about 272.0660477944.

It can be divided in two parts, 20138 and 311, that added together give a square (20449 = 143²).

The spelling of 20138311 in words is "twenty million, one hundred thirty-eight thousand, three hundred eleven".