20401451440 has 40 divisors (see below), whose sum is σ = 47567812608. Its totient is φ = 8137451520.

The previous prime is 20401451429. The next prime is 20401451449. The reversal of 20401451440 is 4415410402.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20401451449) 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, 332976 + ... + 389455.

Almost surely, 2^20401451440 is an apocalyptic number.

20401451440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401451440 is an abundant number, since it is smaller than the sum of its proper divisors (27166361168).

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

20401451440 is a wasteful number, since it uses less digits than its factorization.

20401451440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722797 (or 722791 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 20401451440 its reverse (4415410402), we get a palindrome (24816861842).

The spelling of 20401451440 in words is "twenty billion, four hundred one million, four hundred fifty-one thousand, four hundred forty".