20268690 has 32 divisors (see below), whose sum is σ = 52387776. Its totient is φ = 4989120.

The previous prime is 20268671. The next prime is 20268691. The reversal of 20268690 is 9686202.

It is a super-2 number, since 2×20268690² = 821639588632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20268691) 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 in 15 ways as a sum of consecutive naturals, for example, 25596 + ... + 26375.

It is an arithmetic number, because the mean of its divisors is an integer number (1637118).

Almost surely, 2^20268690 is an apocalyptic number.

20268690 is an abundant number, since it is smaller than the sum of its proper divisors (32119086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20268690 is a wasteful number, since it uses less digits than its factorization.

20268690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51994.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20268690 is about 4502.0761877161. The cubic root of 20268690 is about 272.6519198895.

The spelling of 20268690 in words is "twenty million, two hundred sixty-eight thousand, six hundred ninety".