20699097500 has 30 divisors (see below), whose sum is σ = 45264791880. Its totient is φ = 8279638000.

The previous prime is 20699097443. The next prime is 20699097521. The reversal of 20699097500 is 579099602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4137320 + ... + 4142319.

It is an arithmetic number, because the mean of its divisors is an integer number (1508826396).

Almost surely, 2^20699097500 is an apocalyptic number.

20699097500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20699097500 is an abundant number, since it is smaller than the sum of its proper divisors (24565694380).

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

20699097500 is an equidigital number, since it uses as much as digits as its factorization.

20699097500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279663 (or 8279646 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 20699097500 in words is "twenty billion, six hundred ninety-nine million, ninety-seven thousand, five hundred".