20152739 has 2 divisors, whose sum is σ = 20152740. Its totient is φ = 20152738.

The previous prime is 20152703. The next prime is 20152747. The reversal of 20152739 is 93725102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20152739 - 2¹² = 20148643 is a prime.

It is a super-2 number, since 2×20152739² = 812265778404242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20152789) 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 as a sum of consecutive naturals, namely, 10076369 + 10076370.

It is an arithmetic number, because the mean of its divisors is an integer number (10076370).

Almost surely, 2^20152739 is an apocalyptic number.

20152739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20152739 is an equidigital number, since it uses as much as digits as its factorization.

20152739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20152739 is about 4489.1802146940. The cubic root of 20152739 is about 272.1310057722.

The spelling of 20152739 in words is "twenty million, one hundred fifty-two thousand, seven hundred thirty-nine".