20292870 has 64 divisors (see below), whose sum is σ = 53371584. Its totient is φ = 4907520.

The previous prime is 20292869. The next prime is 20292889. The reversal of 20292870 is 7829202.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23364 + ... + 24216.

It is an arithmetic number, because the mean of its divisors is an integer number (833931).

Almost surely, 2^20292870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20292870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26685792).

20292870 is an abundant number, since it is smaller than the sum of its proper divisors (33078714).

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

20292870 is a wasteful number, since it uses less digits than its factorization.

20292870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20292870 is about 4504.7608149601. The cubic root of 20292870 is about 272.7602989298.

The spelling of 20292870 in words is "twenty million, two hundred ninety-two thousand, eight hundred seventy".