20380501 has 4 divisors (see below), whose sum is σ = 21579372. Its totient is φ = 19181632.

The previous prime is 20380489. The next prime is 20380537. The reversal of 20380501 is 10508302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16597476 + 3783025 = 4074^2 + 1945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20380501 is a prime.

It is a super-2 number, since 2×20380501² = 830729642022002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599410 + ... + 599443.

It is an arithmetic number, because the mean of its divisors is an integer number (5394843).

Almost surely, 2^20380501 is an apocalyptic number.

It is an amenable number.

20380501 is a deficient number, since it is larger than the sum of its proper divisors (1198871).

20380501 is a wasteful number, since it uses less digits than its factorization.

20380501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198870.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20380501 is about 4514.4768246166. The cubic root of 20380501 is about 273.1523567353.

Adding to 20380501 its reverse (10508302), we get a palindrome (30888803).

The spelling of 20380501 in words is "twenty million, three hundred eighty thousand, five hundred one".