20745750 has 64 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 5464800.

The previous prime is 20745691. The next prime is 20745761. The reversal of 20745750 is 5754702.

It is a super-2 number, since 2×20745750² = 860772286125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104151 + ... + 104349.

It is an arithmetic number, because the mean of its divisors is an integer number (819000).

Almost surely, 2^20745750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20745750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26208000).

20745750 is an abundant number, since it is smaller than the sum of its proper divisors (31670250).

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

20745750 is a wasteful number, since it uses less digits than its factorization.

20745750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20745750 is about 4554.7502675778. The cubic root of 20745750 is about 274.7744707400.

The spelling of 20745750 in words is "twenty million, seven hundred forty-five thousand, seven hundred fifty".