20870616 has 64 divisors (see below), whose sum is σ = 56689920. Its totient is φ = 6364800.

The previous prime is 20870593. The next prime is 20870623. The reversal of 20870616 is 61607802.

It is a happy number.

It is a super-2 number, since 2×20870616² = 871165224438912, which contains 22 as substring.

It is a congruent number.

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, 46891 + ... + 47333.

It is an arithmetic number, because the mean of its divisors is an integer number (885780).

Almost surely, 2^20870616 is an apocalyptic number.

20870616 is a gapful number since it is divisible by the number (26) 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 20870616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28344960).

20870616 is an abundant number, since it is smaller than the sum of its proper divisors (35819304).

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

20870616 is a wasteful number, since it uses less digits than its factorization.

20870616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20870616 is about 4568.4369318181. The cubic root of 20870616 is about 275.3246457961.

The spelling of 20870616 in words is "twenty million, eight hundred seventy thousand, six hundred sixteen".