20299560 has 64 divisors (see below), whose sum is σ = 61387200. Its totient is φ = 5369856.

The previous prime is 20299493. The next prime is 20299577. The reversal of 20299560 is 6599202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16072 + ... + 17288.

It is an arithmetic number, because the mean of its divisors is an integer number (959175).

Almost surely, 2^20299560 is an apocalyptic number.

20299560 is a gapful number since it is divisible by the number (20) 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 20299560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30693600).

20299560 is an abundant number, since it is smaller than the sum of its proper divisors (41087640).

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

20299560 is a wasteful number, since it uses less digits than its factorization.

20299560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20299560 is about 4505.5033015192. The cubic root of 20299560 is about 272.7902694878.

The spelling of 20299560 in words is "twenty million, two hundred ninety-nine thousand, five hundred sixty".