20457689349620 has 48 divisors (see below), whose sum is σ = 44448738768000. Its totient is φ = 7899803425920.

The previous prime is 20457689349593. The next prime is 20457689349641. The reversal of 20457689349620 is 2694398675402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1736681 + ... + 6628079.

It is an arithmetic number, because the mean of its divisors is an integer number (926015391000).

Almost surely, 2^{20457689349620} is an apocalyptic number.

20457689349620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20457689349620 is an abundant number, since it is smaller than the sum of its proper divisors (23991049418380).

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

20457689349620 is a wasteful number, since it uses less digits than its factorization.

20457689349620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898648 (or 4898646 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 65.

The spelling of 20457689349620 in words is "twenty trillion, four hundred fifty-seven billion, six hundred eighty-nine million, three hundred forty-nine thousand, six hundred twenty".