20430221040 has 120 divisors (see below), whose sum is σ = 71594658720. Its totient is φ = 5211182592.

The previous prime is 20430221039. The next prime is 20430221041. The reversal of 20430221040 is 4012203402.

20430221040 is a `hidden beast` number, since 20 + 430 + 2 + 210 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20430221039) and next prime (20430221041).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430221041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 600295 + ... + 633414.

It is an arithmetic number, because the mean of its divisors is an integer number (596622156).

Almost surely, 2^20430221040 is an apocalyptic number.

20430221040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430221040 is an abundant number, since it is smaller than the sum of its proper divisors (51164437680).

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

20430221040 is a wasteful number, since it uses less digits than its factorization.

20430221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233751 (or 1233742 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20430221040 its reverse (4012203402), we get a palindrome (24442424442).

The spelling of 20430221040 in words is "twenty billion, four hundred thirty million, two hundred twenty-one thousand, forty".