20749238947400 has 96 divisors (see below), whose sum is σ = 50362291607040. Its totient is φ = 7935238248960.

The previous prime is 20749238947267. The next prime is 20749238947427. The reversal of 20749238947400 is 474983294702.

It is a self number, because there is not a number n which added to its sum of digits gives 20749238947400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9130292 + ... + 11174108.

It is an arithmetic number, because the mean of its divisors is an integer number (524607204240).

Almost surely, 2^{20749238947400} is an apocalyptic number.

20749238947400 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 20749238947400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25181145803520).

20749238947400 is an abundant number, since it is smaller than the sum of its proper divisors (29613052659640).

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

20749238947400 is a wasteful number, since it uses less digits than its factorization.

20749238947400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046063 (or 2046054 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 59.

The spelling of 20749238947400 in words is "twenty trillion, seven hundred forty-nine billion, two hundred thirty-eight million, nine hundred forty-seven thousand, four hundred".