2020400021 has 8 divisors (see below), whose sum is σ = 2068058784. Its totient is φ = 1972771920.

The previous prime is 2020399999. The next prime is 2020400033. The reversal of 2020400021 is 1200040202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2020400021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020399975 and 2020400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020405021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177710 + ... + 188736.

It is an arithmetic number, because the mean of its divisors is an integer number (258507348).

Almost surely, 2^2020400021 is an apocalyptic number.

It is an amenable number.

2020400021 is a deficient number, since it is larger than the sum of its proper divisors (47658763).

2020400021 is a wasteful number, since it uses less digits than its factorization.

2020400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15331.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2020400021 is about 44948.8600634098. The cubic root of 2020400021 is about 1264.1903031333.

Adding to 2020400021 its reverse (1200040202), we get a palindrome (3220440223).

The spelling of 2020400021 in words is "two billion, twenty million, four hundred thousand, twenty-one".