20501010 has 24 divisors (see below), whose sum is σ = 53302860. Its totient is φ = 5466912.

The previous prime is 20501009. The next prime is 20501011. The reversal of 20501010 is 1010502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20501009) and next prime (20501011).

It can be written as a sum of positive squares in 2 ways, for example, as 20061441 + 439569 = 4479^2 + 663^2 .

It is a super-2 number, since 2×20501010² = 840582822040200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20500983 and 20501001.

It is not an unprimeable number, because it can be changed into a prime (20501011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113805 + ... + 113984.

Almost surely, 2^20501010 is an apocalyptic number.

20501010 is an abundant number, since it is smaller than the sum of its proper divisors (32801850).

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

20501010 is a wasteful number, since it uses less digits than its factorization.

20501010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227802 (or 227799 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 20501010 is about 4527.8041035363. The cubic root of 20501010 is about 273.6896783334.

Adding to 20501010 its reverse (1010502), we get a palindrome (21511512).

The spelling of 20501010 in words is "twenty million, five hundred one thousand, ten".