20251220 has 24 divisors (see below), whose sum is σ = 46394208. Its totient is φ = 7364000.

The previous prime is 20251211. The next prime is 20251223. The reversal of 20251220 is 2215202.

It is a super-2 number, since 2×20251220² = 820223822976800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20251195 and 20251204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45806 + ... + 46245.

It is an arithmetic number, because the mean of its divisors is an integer number (1933092).

Almost surely, 2^20251220 is an apocalyptic number.

20251220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251220 is an abundant number, since it is smaller than the sum of its proper divisors (26142988).

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

20251220 is a wasteful number, since it uses less digits than its factorization.

20251220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92071 (or 92069 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20251220 is about 4500.1355535139. The cubic root of 20251220 is about 272.5735626103.

Adding to 20251220 its reverse (2215202), we get a palindrome (22466422).

The spelling of 20251220 in words is "twenty million, two hundred fifty-one thousand, two hundred twenty".