263641020 has 48 divisors (see below), whose sum is σ = 739404960. Its totient is φ = 70189056.

The previous prime is 263641013. The next prime is 263641031. The reversal of 263641020 is 20146362.

It is a congruent number.

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, 37116 + ... + 43644.

It is an arithmetic number, because the mean of its divisors is an integer number (15404270).

Almost surely, 2^263641020 is an apocalyptic number.

263641020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263641020 is an abundant number, since it is smaller than the sum of its proper divisors (475763940).

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

263641020 is a wasteful number, since it uses less digits than its factorization.

263641020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214 (or 7212 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 263641020 is about 16237.0262055587. The cubic root of 263641020 is about 641.2159662599.

Adding to 263641020 its reverse (20146362), we get a palindrome (283787382).

The spelling of 263641020 in words is "two hundred sixty-three million, six hundred forty-one thousand, twenty".