20747754720 has 960 divisors, whose sum is σ = 96739163136. Its totient is φ = 4054302720.

The previous prime is 20747754707. The next prime is 20747754733. The reversal of 20747754720 is 2745774702.

20747754720 = T₂₇₄₄₀ + T₂₇₄₄₁ + ... + T₂₇₄₉₄.

It is an interprime number because it is at equal distance from previous prime (20747754707) and next prime (20747754733).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 16964029 + ... + 16965251.

Almost surely, 2^20747754720 is an apocalyptic number.

20747754720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20747754720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48369581568).

20747754720 is an abundant number, since it is smaller than the sum of its proper divisors (75991408416).

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

20747754720 is a wasteful number, since it uses less digits than its factorization.

20747754720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 768320, while the sum is 45.

The spelling of 20747754720 in words is "twenty billion, seven hundred forty-seven million, seven hundred fifty-four thousand, seven hundred twenty".