20401420 has 24 divisors (see below), whose sum is σ = 46139184. Its totient is φ = 7532736.

The previous prime is 20401397. The next prime is 20401427. The reversal of 20401420 is 2410402.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 20401420.

It is not an unprimeable number, because it can be changed into a prime (20401427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38974 + ... + 39493.

It is an arithmetic number, because the mean of its divisors is an integer number (1922466).

Almost surely, 2^20401420 is an apocalyptic number.

20401420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401420 is an abundant number, since it is smaller than the sum of its proper divisors (25737764).

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

20401420 is a wasteful number, since it uses less digits than its factorization.

20401420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78489 (or 78487 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20401420 is about 4516.7931101612. The cubic root of 20401420 is about 273.2457813317.

Adding to 20401420 its reverse (2410402), we get a palindrome (22811822).

The spelling of 20401420 in words is "twenty million, four hundred one thousand, four hundred twenty".