20713501 has 4 divisors (see below), whose sum is σ = 21614112. Its totient is φ = 19812892.

The previous prime is 20713489. The next prime is 20713529. The reversal of 20713501 is 10531702.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10531702 = 2 ⋅5265851.

It is a cyclic number.

It is not a de Polignac number, because 20713501 - 2⁷ = 20713373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713541) 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, 450271 + ... + 450316.

It is an arithmetic number, because the mean of its divisors is an integer number (5403528).

Almost surely, 2^20713501 is an apocalyptic number.

It is an amenable number.

20713501 is a deficient number, since it is larger than the sum of its proper divisors (900611).

20713501 is an equidigital number, since it uses as much as digits as its factorization.

20713501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900610.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20713501 is about 4551.2087405435. The cubic root of 20713501 is about 274.6320191146.

The spelling of 20713501 in words is "twenty million, seven hundred thirteen thousand, five hundred one".