20898810 has 40 divisors (see below), whose sum is σ = 56196756. Its totient is φ = 5572800.

The previous prime is 20898809. The next prime is 20898827. The reversal of 20898810 is 1889802.

It can be written as a sum of positive squares in 2 ways, for example, as 20820969 + 77841 = 4563^2 + 279^2 .

It is a super-2 number, since 2×20898810² = 873520518832200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12091 + ... + 13710.

Almost surely, 2^20898810 is an apocalyptic number.

20898810 is an abundant number, since it is smaller than the sum of its proper divisors (35297946).

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

20898810 is a wasteful number, since it uses less digits than its factorization.

20898810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25820 (or 25811 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 20898810 is about 4571.5216285171. The cubic root of 20898810 is about 275.4485681925.

The spelling of 20898810 in words is "twenty million, eight hundred ninety-eight thousand, eight hundred ten".