20857553490 has 32 divisors (see below), whose sum is σ = 50282620416. Its totient is φ = 5537070720.

The previous prime is 20857553477. The next prime is 20857553491. The reversal of 20857553490 is 9435575802.

It is a super-2 number, since 2×20857553490² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20857553491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1552171 + ... + 1565550.

It is an arithmetic number, because the mean of its divisors is an integer number (1571331888).

Almost surely, 2^20857553490 is an apocalyptic number.

20857553490 is an abundant number, since it is smaller than the sum of its proper divisors (29425066926).

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

20857553490 is a wasteful number, since it uses less digits than its factorization.

20857553490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117954.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 20857553490 in words is "twenty billion, eight hundred fifty-seven million, five hundred fifty-three thousand, four hundred ninety".