20530956390 has 48 divisors (see below), whose sum is σ = 57319082352. Its totient is φ = 4692789696.

The previous prime is 20530956359. The next prime is 20530956401. The reversal of 20530956390 is 9365903502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6981849 + ... + 6984788.

It is an arithmetic number, because the mean of its divisors is an integer number (1194147549).

Almost surely, 2^20530956390 is an apocalyptic number.

20530956390 is an abundant number, since it is smaller than the sum of its proper divisors (36788125962).

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

20530956390 is a wasteful number, since it uses less digits than its factorization.

20530956390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13966661 (or 13966654 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 42.

The spelling of 20530956390 in words is "twenty billion, five hundred thirty million, nine hundred fifty-six thousand, three hundred ninety".