20420010 has 96 divisors (see below), whose sum is σ = 59125248. Its totient is φ = 4855680.

The previous prime is 20419981. The next prime is 20420011. The reversal of 20420010 is 1002402.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20419974 and 20420001.

It is not an unprimeable number, because it can be changed into a prime (20420011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35989 + ... + 36551.

It is an arithmetic number, because the mean of its divisors is an integer number (615888).

Almost surely, 2^20420010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29562624).

20420010 is an abundant number, since it is smaller than the sum of its proper divisors (38705238).

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

20420010 is a wasteful number, since it uses less digits than its factorization.

20420010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20420010 is about 4518.8505175542. The cubic root of 20420010 is about 273.3287509973.

Adding to 20420010 its reverse (1002402), we get a palindrome (21422412).

The spelling of 20420010 in words is "twenty million, four hundred twenty thousand, ten".