20267660 has 48 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 6847680.

The previous prime is 20267659. The next prime is 20267671. The reversal of 20267660 is 6676202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8921 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^20267660 is an apocalyptic number.

20267660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20267660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

20267660 is an abundant number, since it is smaller than the sum of its proper divisors (29084020).

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

20267660 is a wasteful number, since it uses less digits than its factorization.

20267660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126 (or 2124 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20267660 is about 4501.9617945958. The cubic root of 20267660 is about 272.6473013335.

The spelling of 20267660 in words is "twenty million, two hundred sixty-seven thousand, six hundred sixty".