20945149240 has 64 divisors (see below), whose sum is σ = 47316772800. Its totient is φ = 8344332288.

The previous prime is 20945149223. The next prime is 20945149261. The reversal of 20945149240 is 4294154902.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20945149193 and 20945149202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16148272 + ... + 16149568.

It is an arithmetic number, because the mean of its divisors is an integer number (739324575).

Almost surely, 2^20945149240 is an apocalyptic number.

20945149240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20945149240 is an abundant number, since it is smaller than the sum of its proper divisors (26371623560).

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

20945149240 is a wasteful number, since it uses less digits than its factorization.

20945149240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624 (or 2620 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20945149240 in words is "twenty billion, nine hundred forty-five million, one hundred forty-nine thousand, two hundred forty".