20251320 has 32 divisors (see below), whose sum is σ = 60754320. Its totient is φ = 5400320.

The previous prime is 20251303. The next prime is 20251333. The reversal of 20251320 is 2315202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20251320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84261 + ... + 84500.

Almost surely, 2^20251320 is an apocalyptic number.

20251320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251320 is an abundant number, since it is smaller than the sum of its proper divisors (40503000).

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

20251320 is a wasteful number, since it uses less digits than its factorization.

20251320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168775 (or 168771 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20251320 is about 4500.1466642766. The cubic root of 20251320 is about 272.5740112633.

Adding to 20251320 its reverse (2315202), we get a palindrome (22566522).

The spelling of 20251320 in words is "twenty million, two hundred fifty-one thousand, three hundred twenty".