20810790 has 288 divisors, whose sum is σ = 76416480. Its totient is φ = 3991680.

The previous prime is 20810759. The next prime is 20810809. The reversal of 20810790 is 9701802.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1600824 + ... + 1600836.

It is an arithmetic number, because the mean of its divisors is an integer number (265335).

Almost surely, 2^20810790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20810790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38208240).

20810790 is an abundant number, since it is smaller than the sum of its proper divisors (55605690).

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

20810790 is a wasteful number, since it uses less digits than its factorization.

20810790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20810790 is about 4561.8844790284. The cubic root of 20810790 is about 275.0613196592.

The spelling of 20810790 in words is "twenty million, eight hundred ten thousand, seven hundred ninety".