20010221440 has 64 divisors (see below), whose sum is σ = 52185766320. Its totient is φ = 7276441600.

The previous prime is 20010221419. The next prime is 20010221443. The reversal of 20010221440 is 4412201002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010221443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414141 + ... + 1428220.

Almost surely, 2^20010221440 is an apocalyptic number.

20010221440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010221440 is an abundant number, since it is smaller than the sum of its proper divisors (32175544880).

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

20010221440 is a wasteful number, since it uses less digits than its factorization.

20010221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842391 (or 2842379 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20010221440 its reverse (4412201002), we get a palindrome (24422422442).

The spelling of 20010221440 in words is "twenty billion, ten million, two hundred twenty-one thousand, four hundred forty".