20709357 has 8 divisors (see below), whose sum is σ = 27653760. Its totient is φ = 13785600.

The previous prime is 20709347. The next prime is 20709391. The reversal of 20709357 is 75390702.

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

It is not a de Polignac number, because 20709357 - 2¹² = 20705261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709347) 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, 2644 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (3456720).

Almost surely, 2^20709357 is an apocalyptic number.

It is an amenable number.

20709357 is a deficient number, since it is larger than the sum of its proper divisors (6944403).

20709357 is an equidigital number, since it uses as much as digits as its factorization.

20709357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20709357 is about 4550.7534540997. The cubic root of 20709357 is about 274.6137033474.

The spelling of 20709357 in words is "twenty million, seven hundred nine thousand, three hundred fifty-seven".