20913699 has 8 divisors (see below), whose sum is σ = 29352640. Its totient is φ = 13208616.

The previous prime is 20913643. The next prime is 20913707. The reversal of 20913699 is 99631902.

It is a happy number.

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

It is not a de Polignac number, because 20913699 - 2¹¹ = 20911651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20913799) 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, 183397 + ... + 183510.

It is an arithmetic number, because the mean of its divisors is an integer number (3669080).

Almost surely, 2^20913699 is an apocalyptic number.

20913699 is a deficient number, since it is larger than the sum of its proper divisors (8438941).

20913699 is a wasteful number, since it uses less digits than its factorization.

20913699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366929.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 20913699 is about 4573.1497898057. The cubic root of 20913699 is about 275.5139655394.

It can be divided in two parts, 20913 and 699, that added together give a palindrome (21612).

The spelling of 20913699 in words is "twenty million, nine hundred thirteen thousand, six hundred ninety-nine".