20540420 has 24 divisors (see below), whose sum is σ = 45672984. Its totient is φ = 7732736.

The previous prime is 20540419. The next prime is 20540431. The reversal of 20540420 is 2404502.

It can be written as a sum of positive squares in 4 ways, for example, as 8248384 + 12292036 = 2872^2 + 3506^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29867 + ... + 30546.

It is an arithmetic number, because the mean of its divisors is an integer number (1903041).

Almost surely, 2^20540420 is an apocalyptic number.

20540420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20540420 is an abundant number, since it is smaller than the sum of its proper divisors (25132564).

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

20540420 is a wasteful number, since it uses less digits than its factorization.

20540420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60439 (or 60437 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20540420 is about 4532.1540132701. The cubic root of 20540420 is about 273.8649413416.

Adding to 20540420 its reverse (2404502), we get a palindrome (22944922).

The spelling of 20540420 in words is "twenty million, five hundred forty thousand, four hundred twenty".