20279320 has 16 divisors (see below), whose sum is σ = 45628560. Its totient is φ = 8111712.

The previous prime is 20279309. The next prime is 20279321. The reversal of 20279320 is 2397202.

It is a super-2 number, since 2×20279320² = 822501639324800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253452 + ... + 253531.

It is an arithmetic number, because the mean of its divisors is an integer number (2851785).

Almost surely, 2^20279320 is an apocalyptic number.

20279320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20279320 is an abundant number, since it is smaller than the sum of its proper divisors (25349240).

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

20279320 is a wasteful number, since it uses less digits than its factorization.

20279320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506994 (or 506990 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20279320 is about 4503.2565993956. The cubic root of 20279320 is about 272.6995760426.

The spelling of 20279320 in words is "twenty million, two hundred seventy-nine thousand, three hundred twenty".