20969715 has 32 divisors (see below), whose sum is σ = 36832320. Its totient is φ = 10123776.

The previous prime is 20969677. The next prime is 20969719. The reversal of 20969715 is 51796902.

It is not a de Polignac number, because 20969715 - 2¹⁵ = 20936947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20969719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9321 + ... + 11349.

It is an arithmetic number, because the mean of its divisors is an integer number (1151010).

Almost surely, 2^20969715 is an apocalyptic number.

20969715 is a deficient number, since it is larger than the sum of its proper divisors (15862605).

20969715 is a wasteful number, since it uses less digits than its factorization.

20969715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20969715 is about 4579.2701383517. The cubic root of 20969715 is about 275.7597284056.

It can be divided in two parts, 2096 and 9715, that added together give a palindrome (11811).

The spelling of 20969715 in words is "twenty million, nine hundred sixty-nine thousand, seven hundred fifteen".