10449781020 has 72 divisors (see below), whose sum is σ = 36225911904. Its totient is φ = 2388521088.

The previous prime is 10449781019. The next prime is 10449781021. The reversal of 10449781020 is 2018794401.

It is an interprime number because it is at equal distance from previous prime (10449781019) and next prime (10449781021).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10449781021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4145479 + ... + 4147998.

Almost surely, 2^10449781020 is an apocalyptic number.

10449781020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10449781020 is an abundant number, since it is smaller than the sum of its proper divisors (25776130884).

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

10449781020 is a wasteful number, since it uses less digits than its factorization.

10449781020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8293499 (or 8293494 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 10449781020 in words is "ten billion, four hundred forty-nine million, seven hundred eighty-one thousand, twenty".