20302661820 has 96 divisors (see below), whose sum is σ = 64987969536. Its totient is φ = 4639219200.

The previous prime is 20302661779. The next prime is 20302661837. The reversal of 20302661820 is 2816620302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 2192400 + ... + 2201640.

It is an arithmetic number, because the mean of its divisors is an integer number (676958016).

Almost surely, 2^20302661820 is an apocalyptic number.

20302661820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20302661820 is an abundant number, since it is smaller than the sum of its proper divisors (44685307716).

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

20302661820 is a wasteful number, since it uses less digits than its factorization.

20302661820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14491 (or 14489 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 20302661820 in words is "twenty billion, three hundred two million, six hundred sixty-one thousand, eight hundred twenty".