26431020 has 144 divisors (see below), whose sum is σ = 100009728. Its totient is φ = 5489280.

The previous prime is 26431001. The next prime is 26431049. The reversal of 26431020 is 2013462.

It is a happy number.

26431020 is a `hidden beast` number, since 2 + 643 + 1 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 26430984 and 26431002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12907 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (694512).

Almost surely, 2^26431020 is an apocalyptic number.

26431020 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 26431020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50004864).

26431020 is an abundant number, since it is smaller than the sum of its proper divisors (73578708).

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

26431020 is a wasteful number, since it uses less digits than its factorization.

26431020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940 (or 1935 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 26431020 is about 5141.1107749201. The cubic root of 26431020 is about 297.8776880448.

Adding to 26431020 its reverse (2013462), we get a palindrome (28444482).

It can be divided in two parts, 2643 and 1020, that added together give a palindrome (3663).

The spelling of 26431020 in words is "twenty-six million, four hundred thirty-one thousand, twenty".