20454737240 has 64 divisors (see below), whose sum is σ = 53318468160. Its totient is φ = 6916976640.

The previous prime is 20454737239. The next prime is 20454737279. The reversal of 20454737240 is 4273745402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20454737194 and 20454737203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479921 + ... + 520800.

It is an arithmetic number, because the mean of its divisors is an integer number (833101065).

Almost surely, 2^20454737240 is an apocalyptic number.

20454737240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454737240 is an abundant number, since it is smaller than the sum of its proper divisors (32863730920).

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

20454737240 is a wasteful number, since it uses less digits than its factorization.

20454737240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000812 (or 1000808 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 38.

The spelling of 20454737240 in words is "twenty billion, four hundred fifty-four million, seven hundred thirty-seven thousand, two hundred forty".