20998810 has 16 divisors (see below), whose sum is σ = 43197696. Its totient is φ = 7199568.

The previous prime is 20998787. The next prime is 20998829. The reversal of 20998810 is 1889902.

It is a super-2 number, since 2×20998810² = 881900042832200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20998810.

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, 149922 + ... + 150061.

It is an arithmetic number, because the mean of its divisors is an integer number (2699856).

Almost surely, 2^20998810 is an apocalyptic number.

20998810 is an abundant number, since it is smaller than the sum of its proper divisors (22198886).

20998810 is a wasteful number, since it uses less digits than its factorization.

20998810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299997.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 20998810 is about 4582.4458534717. The cubic root of 20998810 is about 275.8872062385.

The spelling of 20998810 in words is "twenty million, nine hundred ninety-eight thousand, eight hundred ten".