20465320 has 16 divisors (see below), whose sum is σ = 46047060. Its totient is φ = 8186112.

The previous prime is 20465309. The next prime is 20465321. The reversal of 20465320 is 2356402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 376996 = 4482^2 + 614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20465291 and 20465300.

It is not an unprimeable number, because it can be changed into a prime (20465321) 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, 255777 + ... + 255856.

Almost surely, 2^20465320 is an apocalyptic number.

20465320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20465320 is an abundant number, since it is smaller than the sum of its proper divisors (25581740).

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

20465320 is a wasteful number, since it uses less digits than its factorization.

20465320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511644 (or 511640 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20465320 is about 4523.8611826624. The cubic root of 20465320 is about 273.5307648874.

The spelling of 20465320 in words is "twenty million, four hundred sixty-five thousand, three hundred twenty".