20451401040 has 80 divisors (see below), whose sum is σ = 72456398208. Its totient is φ = 4674605568.

The previous prime is 20451401039. The next prime is 20451401041. The reversal of 20451401040 is 4010415402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20451401039) and next prime (20451401041).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20451400998 and 20451401016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451401041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6085047 + ... + 6088406.

Almost surely, 2^20451401040 is an apocalyptic number.

20451401040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451401040 is an abundant number, since it is smaller than the sum of its proper divisors (52004997168).

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

20451401040 is a wasteful number, since it uses less digits than its factorization.

20451401040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12173476 (or 12173470 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 20451401040 its reverse (4010415402), we get a palindrome (24461816442).

The spelling of 20451401040 in words is "twenty billion, four hundred fifty-one million, four hundred one thousand, forty".