20899692 has 72 divisors (see below), whose sum is σ = 58378320. Its totient is φ = 6251520.

The previous prime is 20899679. The next prime is 20899693. The reversal of 20899692 is 29699802.

It is not an unprimeable number, because it can be changed into a prime (20899693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34948 + ... + 35540.

It is an arithmetic number, because the mean of its divisors is an integer number (810810).

Almost surely, 2^20899692 is an apocalyptic number.

20899692 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20899692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29189160).

20899692 is an abundant number, since it is smaller than the sum of its proper divisors (37478628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20899692 is a wasteful number, since it uses less digits than its factorization.

20899692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20899692 is about 4571.6180942857. The cubic root of 20899692 is about 275.4524430897.

It can be divided in two parts, 2089 and 9692, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 20899692 in words is "twenty million, eight hundred ninety-nine thousand, six hundred ninety-two".