20742151 has 2 divisors, whose sum is σ = 20742152. Its totient is φ = 20742150.

The previous prime is 20742109. The next prime is 20742179. The reversal of 20742151 is 15124702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20742151 - 2¹⁷ = 20611079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20742101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371075 + 10371076.

It is an arithmetic number, because the mean of its divisors is an integer number (10371076).

Almost surely, 2^20742151 is an apocalyptic number.

20742151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20742151 is an equidigital number, since it uses as much as digits as its factorization.

20742151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20742151 is about 4554.3551684075. The cubic root of 20742151 is about 274.7585804088.

Adding to 20742151 its reverse (15124702), we get a palindrome (35866853).

It can be divided in two parts, 2074 and 2151, that added together give a square (4225 = 65²).

The spelling of 20742151 in words is "twenty million, seven hundred forty-two thousand, one hundred fifty-one".