20661063420 has 48 divisors (see below), whose sum is σ = 58501003680. Its totient is φ = 5447709696.

The previous prime is 20661063419. The next prime is 20661063433. The reversal of 20661063420 is 2436016602.

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 15 ways as a sum of consecutive naturals, for example, 1929217 + ... + 1939896.

It is an arithmetic number, because the mean of its divisors is an integer number (1218770910).

Almost surely, 2^20661063420 is an apocalyptic number.

20661063420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20661063420 is an abundant number, since it is smaller than the sum of its proper divisors (37839940260).

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

20661063420 is a wasteful number, since it uses less digits than its factorization.

20661063420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869214 (or 3869212 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 20661063420 in words is "twenty billion, six hundred sixty-one million, sixty-three thousand, four hundred twenty".