20688468 has 24 divisors (see below), whose sum is σ = 49092960. Its totient is φ = 6779040.

The previous prime is 20688463. The next prime is 20688517. The reversal of 20688468 is 86488602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13903 + ... + 15318.

It is an arithmetic number, because the mean of its divisors is an integer number (2045540).

Almost surely, 2^20688468 is an apocalyptic number.

It is an amenable number.

20688468 is an abundant number, since it is smaller than the sum of its proper divisors (28404492).

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

20688468 is a wasteful number, since it uses less digits than its factorization.

20688468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29287 (or 29285 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 20688468 is about 4548.4577606041. The cubic root of 20688468 is about 274.5213403404.

The spelling of 20688468 in words is "twenty million, six hundred eighty-eight thousand, four hundred sixty-eight".