20021610 has 64 divisors (see below), whose sum is σ = 55775232. Its totient is φ = 4504896.

The previous prime is 20021549. The next prime is 20021623. The reversal of 20021610 is 1612002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13359 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (871488).

Almost surely, 2^20021610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27887616).

20021610 is an abundant number, since it is smaller than the sum of its proper divisors (35753622).

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

20021610 is a wasteful number, since it uses less digits than its factorization.

20021610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20021610 is about 4474.5513741603. The cubic root of 20021610 is about 271.5394907437.

Adding to 20021610 its reverse (1612002), we get a palindrome (21633612).

The spelling of 20021610 in words is "twenty million, twenty-one thousand, six hundred ten".