20742375 has 16 divisors (see below), whose sum is σ = 34515936. Its totient is φ = 11062400.

The previous prime is 20742353. The next prime is 20742377. The reversal of 20742375 is 57324702.

It is not a de Polignac number, because 20742375 - 2⁷ = 20742247 is a prime.

It is a super-2 number, since 2×20742375² = 860492241281250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27282 + ... + 28031.

It is an arithmetic number, because the mean of its divisors is an integer number (2157246).

Almost surely, 2^20742375 is an apocalyptic number.

20742375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20742375 is a deficient number, since it is larger than the sum of its proper divisors (13773561).

20742375 is an equidigital number, since it uses as much as digits as its factorization.

20742375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55331 (or 55321 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 20742375 is about 4554.3797601869. The cubic root of 20742375 is about 274.7595694689.

The spelling of 20742375 in words is "twenty million, seven hundred forty-two thousand, three hundred seventy-five".