20735690 has 16 divisors (see below), whose sum is σ = 37710792. Its totient is φ = 8208384.

The previous prime is 20735681. The next prime is 20735711. The reversal of 20735690 is 9653702.

It can be written as a sum of positive squares in 4 ways, for example, as 11082241 + 9653449 = 3329^2 + 3107^2 .

It is a super-2 number, since 2×20735690² = 859937679552200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9719 + ... + 11658.

Almost surely, 2^20735690 is an apocalyptic number.

20735690 is a deficient number, since it is larger than the sum of its proper divisors (16975102).

20735690 is a wasteful number, since it uses less digits than its factorization.

20735690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21481.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20735690 is about 4553.6457921099. The cubic root of 20735690 is about 274.7300491419.

The spelling of 20735690 in words is "twenty million, seven hundred thirty-five thousand, six hundred ninety".