20281696 has 12 divisors (see below), whose sum is σ = 39929652. Its totient is φ = 10140832.

The previous prime is 20281687. The next prime is 20281711. The reversal of 20281696 is 69618202.

It is a happy number.

It is a super-2 number, since 2×20281696² = 822694385272832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316870 + ... + 316933.

It is an arithmetic number, because the mean of its divisors is an integer number (3327471).

Almost surely, 2^20281696 is an apocalyptic number.

It is an amenable number.

20281696 is a deficient number, since it is larger than the sum of its proper divisors (19647956).

20281696 is an equidigital number, since it uses as much as digits as its factorization.

20281696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633813 (or 633805 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20281696 is about 4503.5204007532. The cubic root of 20281696 is about 272.7102257897.

Adding to 20281696 its reverse (69618202), we get a palindrome (89899898).

The spelling of 20281696 in words is "twenty million, two hundred eighty-one thousand, six hundred ninety-six".