25402020 has 96 divisors (see below), whose sum is σ = 83951616. Its totient is φ = 5616000.

The previous prime is 25402019. The next prime is 25402021. The reversal of 25402020 is 2020452.

It is an interprime number because it is at equal distance from previous prime (25402019) and next prime (25402021).

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

It is not an unprimeable number, because it can be changed into a prime (25402021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12045 + ... + 13995.

It is an arithmetic number, because the mean of its divisors is an integer number (874496).

Almost surely, 2^25402020 is an apocalyptic number.

25402020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25402020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41975808).

25402020 is an abundant number, since it is smaller than the sum of its proper divisors (58549596).

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

25402020 is a wasteful number, since it uses less digits than its factorization.

25402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 25402020 is about 5040.0416664944. The cubic root of 25402020 is about 293.9607981420.

Adding to 25402020 its reverse (2020452), we get a palindrome (27422472).

It can be divided in two parts, 2540 and 2020, that added together give a triangular number (4560 = T₉₅).

The spelling of 25402020 in words is "twenty-five million, four hundred two thousand, twenty".