20210140 has 48 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 7603200.

The previous prime is 20210131. The next prime is 20210143. The reversal of 20210140 is 4101202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22500 + ... + 23380.

It is an arithmetic number, because the mean of its divisors is an integer number (938448).

Almost surely, 2^20210140 is an apocalyptic number.

20210140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20210140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22522752).

20210140 is an abundant number, since it is smaller than the sum of its proper divisors (24835364).

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

20210140 is a wasteful number, since it uses less digits than its factorization.

20210140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20210140 is about 4495.5689295127. The cubic root of 20210140 is about 272.3891308933.

Adding to 20210140 its reverse (4101202), we get a palindrome (24311342).

The spelling of 20210140 in words is "twenty million, two hundred ten thousand, one hundred forty".