20401504440 has 32 divisors (see below), whose sum is σ = 61204513680. Its totient is φ = 5440401152.

The previous prime is 20401504427. The next prime is 20401504471. The reversal of 20401504440 is 4440510402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20401504440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85006149 + ... + 85006388.

Almost surely, 2^20401504440 is an apocalyptic number.

20401504440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401504440 is an abundant number, since it is smaller than the sum of its proper divisors (40803009240).

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

20401504440 is a wasteful number, since it uses less digits than its factorization.

20401504440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170012551 (or 170012547 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The spelling of 20401504440 in words is "twenty billion, four hundred one million, five hundred four thousand, four hundred forty".