20251020 has 24 divisors (see below), whose sum is σ = 56703024. Its totient is φ = 5400256.

The previous prime is 20251013. The next prime is 20251027. The reversal of 20251020 is 2015202.

It is an interprime number because it is at equal distance from previous prime (20251013) and next prime (20251027).

It is a super-2 number, since 2×20251020² = 820207622080800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20250987 and 20251005.

It is not an unprimeable number, because it can be changed into a prime (20251027) 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, 168699 + ... + 168818.

It is an arithmetic number, because the mean of its divisors is an integer number (2362626).

Almost surely, 2^20251020 is an apocalyptic number.

20251020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20251020 is an abundant number, since it is smaller than the sum of its proper divisors (36452004).

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

20251020 is a wasteful number, since it uses less digits than its factorization.

20251020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337529 (or 337527 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20251020 is about 4500.1133319062. The cubic root of 20251020 is about 272.5726652998.

Adding to 20251020 its reverse (2015202), we get a palindrome (22266222).

The spelling of 20251020 in words is "twenty million, two hundred fifty-one thousand, twenty".