20854470 has 64 divisors (see below), whose sum is σ = 61608960. Its totient is φ = 4399488.

The previous prime is 20854469. The next prime is 20854523. The reversal of 20854470 is 7445802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 1090 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (962640).

Almost surely, 2^20854470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20854470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30804480).

20854470 is an abundant number, since it is smaller than the sum of its proper divisors (40754490).

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

20854470 is a wasteful number, since it uses less digits than its factorization.

20854470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7669.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20854470 is about 4566.6694647193. The cubic root of 20854470 is about 275.2536282696.

It can be divided in two parts, 2085 and 4470, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 20854470 in words is "twenty million, eight hundred fifty-four thousand, four hundred seventy".