20001025 has 24 divisors (see below), whose sum is σ = 27257184. Its totient is φ = 14438400.

The previous prime is 20001019. The next prime is 20001029. The reversal of 20001025 is 52010002.

It is not a de Polignac number, because 20001025 - 2¹¹ = 19998977 is a prime.

It is a Duffinian number.

20001025 is a modest number, since divided by 1025 gives 200 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20001029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70534 + ... + 70816.

It is an arithmetic number, because the mean of its divisors is an integer number (1135716).

Almost surely, 2^20001025 is an apocalyptic number.

20001025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20001025 is a deficient number, since it is larger than the sum of its proper divisors (7256159).

20001025 is a wasteful number, since it uses less digits than its factorization.

20001025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20001025 is about 4472.2505520152. The cubic root of 20001025 is about 271.4463987104.

Adding to 20001025 its reverse (52010002), we get a palindrome (72011027).

It can be divided in two parts, 2000 and 1025, that added together give a square (3025 = 55²).

The spelling of 20001025 in words is "twenty million, one thousand, twenty-five".