20154020 has 12 divisors (see below), whose sum is σ = 42323484. Its totient is φ = 8061600.

The previous prime is 20154019. The next prime is 20154037. The reversal of 20154020 is 2045102.

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 14546596 = 2368^2 + 3814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20153986 and 20154004.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 503831 + ... + 503870.

It is an arithmetic number, because the mean of its divisors is an integer number (3526957).

Almost surely, 2^20154020 is an apocalyptic number.

20154020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20154020 is an abundant number, since it is smaller than the sum of its proper divisors (22169464).

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

20154020 is a wasteful number, since it uses less digits than its factorization.

20154020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007710 (or 1007708 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20154020 is about 4489.3228888107. The cubic root of 20154020 is about 272.1367716126.

Adding to 20154020 its reverse (2045102), we get a palindrome (22199122).

The spelling of 20154020 in words is "twenty million, one hundred fifty-four thousand, twenty".