1620203 has 6 divisors (see below), whose sum is σ = 1754604. Its totient is φ = 1495416.

The previous prime is 1620161. The next prime is 1620209. The reversal of 1620203 is 3020261.

It is not a de Polignac number, because 1620203 - 2¹⁰ = 1619179 is a prime.

It is a super-2 number, since 2×1620203² = 5250115522418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4625 + ... + 4962.

It is an arithmetic number, because the mean of its divisors is an integer number (292434).

2^1620203 is an apocalyptic number.

1620203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1620203 is a deficient number, since it is larger than the sum of its proper divisors (134401).

1620203 is an equidigital number, since it uses as much as digits as its factorization.

1620203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9613 (or 9600 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1620203 is about 1272.8719495692. The cubic root of 1620203 is about 117.4509346976.

Adding to 1620203 its reverse (3020261), we get a palindrome (4640464).

The spelling of 1620203 in words is "one million, six hundred twenty thousand, two hundred three".