20399048740 has 24 divisors (see below), whose sum is σ = 48957717312. Its totient is φ = 6993959520.

The previous prime is 20399048707. The next prime is 20399048743. The reversal of 20399048740 is 4784099302.

It is a happy number.

It is a super-2 number, since 2×20399048740² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20399048743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72853606 + ... + 72853885.

It is an arithmetic number, because the mean of its divisors is an integer number (2039904888).

Almost surely, 2^20399048740 is an apocalyptic number.

20399048740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20399048740 is an abundant number, since it is smaller than the sum of its proper divisors (28558668572).

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

20399048740 is a wasteful number, since it uses less digits than its factorization.

20399048740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145707507 (or 145707505 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 20399048740 in words is "twenty billion, three hundred ninety-nine million, forty-eight thousand, seven hundred forty".