20670501 has 4 divisors (see below), whose sum is σ = 27560672. Its totient is φ = 13780332.

The previous prime is 20670497. The next prime is 20670509. The reversal of 20670501 is 10507602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20670501 - 2² = 20670497 is a prime.

It is a super-2 number, since 2×20670501² = 854539223182002, 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 (20670509) 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, 3445081 + ... + 3445086.

It is an arithmetic number, because the mean of its divisors is an integer number (6890168).

Almost surely, 2^20670501 is an apocalyptic number.

It is an amenable number.

20670501 is a deficient number, since it is larger than the sum of its proper divisors (6890171).

20670501 is an equidigital number, since it uses as much as digits as its factorization.

20670501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6890170.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20670501 is about 4546.4822665441. The cubic root of 20670501 is about 274.4418475292.

It can be divided in two parts, 206 and 70501, that added together give a palindrome (70707).

The spelling of 20670501 in words is "twenty million, six hundred seventy thousand, five hundred one".