20902860 has 288 divisors, whose sum is σ = 79252992. Its totient is φ = 4561920.

The previous prime is 20902813. The next prime is 20902873. The reversal of 20902860 is 6820902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 908809 + ... + 908831.

It is an arithmetic number, because the mean of its divisors is an integer number (275184).

Almost surely, 2^20902860 is an apocalyptic number.

20902860 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 20902860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39626496).

20902860 is an abundant number, since it is smaller than the sum of its proper divisors (58350132).

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

20902860 is a wasteful number, since it uses less digits than its factorization.

20902860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20902860 is about 4571.9645667918. The cubic root of 20902860 is about 275.4663601887.

It can be divided in two parts, 2090 and 2860, that added together give a triangular number (4950 = T₉₉).

The spelling of 20902860 in words is "twenty million, nine hundred two thousand, eight hundred sixty".