20501040 has 80 divisors (see below), whose sum is σ = 72638208. Its totient is φ = 4685568.

The previous prime is 20501029. The next prime is 20501069. The reversal of 20501040 is 4010502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 4422 + ... + 7781.

Almost surely, 2^20501040 is an apocalyptic number.

20501040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20501040 is an abundant number, since it is smaller than the sum of its proper divisors (52137168).

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

20501040 is a wasteful number, since it uses less digits than its factorization.

20501040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12226 (or 12220 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20501040 is about 4527.8074163992. The cubic root of 20501040 is about 273.6898118339.

Adding to 20501040 its reverse (4010502), we get a palindrome (24511542).

The spelling of 20501040 in words is "twenty million, five hundred one thousand, forty".