47021820 has 96 divisors (see below), whose sum is σ = 137894400. Its totient is φ = 11960064.

The previous prime is 47021797. The next prime is 47021851. The reversal of 47021820 is 2812074.

It is a super-2 number, since 2×47021820² = 4422103112224800, 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 31 ways as a sum of consecutive naturals, for example, 130801 + ... + 131159.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^47021820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47021820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68947200).

47021820 is an abundant number, since it is smaller than the sum of its proper divisors (90872580).

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

47021820 is a wasteful number, since it uses less digits than its factorization.

47021820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 47021820 is about 6857.2458027987. The cubic root of 47021820 is about 360.9384465971.

Adding to 47021820 its reverse (2812074), we get a palindrome (49833894).

The spelling of 47021820 in words is "forty-seven million, twenty-one thousand, eight hundred twenty".