20139097740 has 24 divisors (see below), whose sum is σ = 56389473840. Its totient is φ = 5370426048.

The previous prime is 20139097679. The next prime is 20139097751. The reversal of 20139097740 is 4779093102.

It is a junction number, because it is equal to n+sod(n) for n = 20139097692 and 20139097701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167825755 + ... + 167825874.

It is an arithmetic number, because the mean of its divisors is an integer number (2349561410).

Almost surely, 2^20139097740 is an apocalyptic number.

20139097740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20139097740 is an abundant number, since it is smaller than the sum of its proper divisors (36250376100).

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

20139097740 is a wasteful number, since it uses less digits than its factorization.

20139097740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335651641 (or 335651639 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The spelling of 20139097740 in words is "twenty billion, one hundred thirty-nine million, ninety-seven thousand, seven hundred forty".