20449737450 has 72 divisors (see below), whose sum is σ = 56713977216. Its totient is φ = 5277348000.

The previous prime is 20449737439. The next prime is 20449737479. The reversal of 20449737450 is 5473794402.

20449737450 is a `hidden beast` number, since 20 + 449 + 73 + 74 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 20449737396 and 20449737405.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 719016 + ... + 746915.

It is an arithmetic number, because the mean of its divisors is an integer number (787694128).

Almost surely, 2^20449737450 is an apocalyptic number.

20449737450 is an abundant number, since it is smaller than the sum of its proper divisors (36264239766).

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

20449737450 is a wasteful number, since it uses less digits than its factorization.

20449737450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465980 (or 1465972 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 20449737450 in words is "twenty billion, four hundred forty-nine million, seven hundred thirty-seven thousand, four hundred fifty".