20921295 has 8 divisors (see below), whose sum is σ = 33474096. Its totient is φ = 11158016.

The previous prime is 20921269. The next prime is 20921309. The reversal of 20921295 is 59212902.

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

It is a cyclic number.

It is not a de Polignac number, because 20921295 - 2¹⁶ = 20855759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697362 + ... + 697391.

It is an arithmetic number, because the mean of its divisors is an integer number (4184262).

Almost surely, 2^20921295 is an apocalyptic number.

20921295 is a deficient number, since it is larger than the sum of its proper divisors (12552801).

20921295 is a wasteful number, since it uses less digits than its factorization.

20921295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394761.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20921295 is about 4573.9802142117. The cubic root of 20921295 is about 275.5473176939.

The spelling of 20921295 in words is "twenty million, nine hundred twenty-one thousand, two hundred ninety-five".