266205420 has 144 divisors (see below), whose sum is σ = 897109920. Its totient is φ = 65505024.

The previous prime is 266205391. The next prime is 266205437. The reversal of 266205420 is 24502662.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89802 + ... + 92718.

It is an arithmetic number, because the mean of its divisors is an integer number (6229930).

Almost surely, 2^266205420 is an apocalyptic number.

266205420 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 266205420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (448554960).

266205420 is an abundant number, since it is smaller than the sum of its proper divisors (630904500).

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

266205420 is a wasteful number, since it uses less digits than its factorization.

266205420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961 (or 2940 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 266205420 is about 16315.8027690948. The cubic root of 266205420 is about 643.2882682659.

The spelling of 266205420 in words is "two hundred sixty-six million, two hundred five thousand, four hundred twenty".