20510961020 has 48 divisors (see below), whose sum is σ = 47010565728. Its totient is φ = 7455068160.

The previous prime is 20510961017. The next prime is 20510961047. The reversal of 20510961020 is 2016901502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479552 + ... + 520568.

It is an arithmetic number, because the mean of its divisors is an integer number (979386786).

Almost surely, 2^20510961020 is an apocalyptic number.

20510961020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20510961020 is an abundant number, since it is smaller than the sum of its proper divisors (26499604708).

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

20510961020 is a wasteful number, since it uses less digits than its factorization.

20510961020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43310 (or 43308 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The spelling of 20510961020 in words is "twenty billion, five hundred ten million, nine hundred sixty-one thousand, twenty".