203120690 has 16 divisors (see below), whose sum is σ = 365978520. Its totient is φ = 81168000.

The previous prime is 203120681. The next prime is 203120747. The reversal of 203120690 is 96021302.

It can be written as a sum of positive squares in 4 ways, for example, as 124567921 + 78552769 = 11161^2 + 8863^2 .

It is a super-2 number, since 2×203120690² = 82516029412152200, which contains 22 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1190 + ... + 20190.

Almost surely, 2^203120690 is an apocalyptic number.

203120690 is a deficient number, since it is larger than the sum of its proper divisors (162857830).

203120690 is a wasteful number, since it uses less digits than its factorization.

203120690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20077.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 203120690 is about 14252.0416081346. The cubic root of 203120690 is about 587.8295142587.

Adding to 203120690 its reverse (96021302), we get a palindrome (299141992).

The spelling of 203120690 in words is "two hundred three million, one hundred twenty thousand, six hundred ninety".