20499515904 has 320 divisors, whose sum is σ = 64644433920. Its totient is φ = 5651251200.

The previous prime is 20499515867. The next prime is 20499515941. The reversal of 20499515904 is 40951599402.

It is an interprime number because it is at equal distance from previous prime (20499515867) and next prime (20499515941).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 46695717 + ... + 46696155.

It is an arithmetic number, because the mean of its divisors is an integer number (202013856).

Almost surely, 2^20499515904 is an apocalyptic number.

20499515904 is a gapful number since it is divisible by the number (24) 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 20499515904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32322216960).

20499515904 is an abundant number, since it is smaller than the sum of its proper divisors (44144918016).

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

20499515904 is a wasteful number, since it uses less digits than its factorization.

20499515904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 20499515904 in words is "twenty billion, four hundred ninety-nine million, five hundred fifteen thousand, nine hundred four".