20954658660 has 192 divisors, whose sum is σ = 67390444800. Its totient is φ = 4819304448.

The previous prime is 20954658629. The next prime is 20954658671. The reversal of 20954658660 is 6685645902.

It is a super-2 number, since 2×20954658660² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1837456 + ... + 1848824.

It is an arithmetic number, because the mean of its divisors is an integer number (350991900).

Almost surely, 2^20954658660 is an apocalyptic number.

20954658660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20954658660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33695222400).

20954658660 is an abundant number, since it is smaller than the sum of its proper divisors (46435786140).

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

20954658660 is a wasteful number, since it uses less digits than its factorization.

20954658660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11550 (or 11548 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 20954658660 in words is "twenty billion, nine hundred fifty-four million, six hundred fifty-eight thousand, six hundred sixty".