20490492624 has 160 divisors (see below), whose sum is σ = 61572725760. Its totient is φ = 5751115776.

The previous prime is 20490492613. The next prime is 20490492629. The reversal of 20490492624 is 42629409402.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490492629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4528027 + ... + 4532549.

It is an arithmetic number, because the mean of its divisors is an integer number (384829536).

Almost surely, 2^20490492624 is an apocalyptic number.

20490492624 is a gapful number since it is divisible by the number (24) 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 20490492624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30786362880).

20490492624 is an abundant number, since it is smaller than the sum of its proper divisors (41082233136).

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

20490492624 is a wasteful number, since it uses less digits than its factorization.

20490492624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4777 (or 4771 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 20490492624 in words is "twenty billion, four hundred ninety million, four hundred ninety-two thousand, six hundred twenty-four".