20686552 has 32 divisors (see below), whose sum is σ = 42189120. Its totient is φ = 9469440.

The previous prime is 20686543. The next prime is 20686553. The reversal of 20686552 is 25568602.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686553) 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, 2977 + ... + 7087.

It is an arithmetic number, because the mean of its divisors is an integer number (1318410).

Almost surely, 2^20686552 is an apocalyptic number.

It is an amenable number.

20686552 is an abundant number, since it is smaller than the sum of its proper divisors (21502568).

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

20686552 is a wasteful number, since it uses less digits than its factorization.

20686552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171 (or 4167 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20686552 is about 4548.2471348861. The cubic root of 20686552 is about 274.5128654238.

The spelling of 20686552 in words is "twenty million, six hundred eighty-six thousand, five hundred fifty-two".