20472858 has 64 divisors (see below), whose sum is σ = 53303040. Its totient is φ = 5702400.

The previous prime is 20472841. The next prime is 20472883. The reversal of 20472858 is 85827402.

It is a happy 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, 14838 + ... + 16158.

It is an arithmetic number, because the mean of its divisors is an integer number (832860).

Almost surely, 2^20472858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20472858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26651520).

20472858 is an abundant number, since it is smaller than the sum of its proper divisors (32830182).

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

20472858 is a wasteful number, since it uses less digits than its factorization.

20472858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20472858 is about 4524.6942438136. The cubic root of 20472858 is about 273.5643439992.

It can be divided in two parts, 20 and 472858, that added together give a triangular number (472878 = T₉₇₂).

The spelling of 20472858 in words is "twenty million, four hundred seventy-two thousand, eight hundred fifty-eight".